diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -87,3 +87,8 @@
 
 * Ninth version. Added also the linear weighted functions that try to increase / decrease the importance of the line ending
 and to decrease /increase the importance of the beginnings.
+
+## 0.9.1.0 -- 2021-08-24
+
+* Ninth version revised A. Fixed issues with the custom rhythmicity in the 'readRhythmicity' function. Some documentation
+improvements.
diff --git a/Rhythmicity/PolyRhythm.hs b/Rhythmicity/PolyRhythm.hs
--- a/Rhythmicity/PolyRhythm.hs
+++ b/Rhythmicity/PolyRhythm.hs
@@ -24,13 +24,31 @@
 import Text.Read (readMaybe)
 import qualified Data.Either as Either (Either(..))
 
+{-| The data type that is used to mark the syllables accordingly to
+their importance in general rhythm constituting. More important syllables
+are marked with the less data constuctors (since the data type has an
+instance of the 'Ord' type class). Contrary to 'PolyMarkers' and 'TF.Marker3s',
+can be used in case of three levels of importance for rhythm constituting
+with the last, fourth 'G' level of the syllables which position is thought as
+not significant (though it actually, is not, but for simplicity).
+-}
 data Marker4s = D | E | F | G deriving (Eq,Ord,Show)
 
+{-| The data type that is used to mark the syllables accordingly to
+their importance in general rhythm constituting. More important syllables
+are marked with the less data constuctors (since the data type has an
+instance of the 'Ord' type class). A generalization of the
+'Marker4s' and 'TF.Marker3s' for the cases of multiple (may be 4, or 3, or more)
+levels of importance in general rhythm constituting.
+-}
 newtype PolyMarkers = PolyMs Char deriving (Eq,Ord)
 
 instance Show PolyMarkers where
   show (PolyMs c) = 'P':' ':[toLower c]
 
+{-| A data type is used to allow usage of the 'Marker4s' and 'PolyMarkers' data types in the
+functions as just one single (unified) data type.
+-}
 data PolyMrks = R4 Marker4s | RP PolyMarkers deriving (Eq,Ord,Show)
 
 is4s :: PolyMrks -> Bool
@@ -56,8 +74,11 @@
 } deriving Eq
 
 {-| The predicate to check whether the two given arguments can be used together to get meaningful results.
+The 'pqty' of the first argument must be equal to the 'sum' of the 'PolyRhythmBasis' 'Int' values
+inside the list. There are also other logical constraints that the function takes into account.
 -}
-validPolyChRhPair :: PolyChoices -> PolyRhythmBasis -> Bool
+validPolyChRhPair :: PolyChoices -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
+ -> Bool
 validPolyChRhPair (PolyCh xs n) (PolyRhythm ys)
  | ks <= [0] = False
  | any (<0) rs = False
@@ -66,6 +87,8 @@
      where (ks,rs) = splitAt 1 ys
            l = length ys - 1
 
+{-| Auxiliary data type that is used internally in the 'getPolyChRhData' function in the module.
+-}
 data Intermediate a = J a | I PolyMarkers deriving (Eq, Ord)
 
 isJI :: Intermediate a -> Bool
@@ -79,8 +102,8 @@
 getPolyChRhData
   :: (Ord a) => Char -- ^ The start of the 'RP' 'PolyMarkers' count in case of 'PolyMrks' with 'Char's. The usual one can be \'a\' or \'h\'.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> [[PolyMrks]]
 getPolyChRhData c r choice@(PolyCh ts l1) rhythm@(PolyRhythm ys) xs
@@ -662,8 +685,8 @@
 rhythmicityPoly
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double -- ^ The greater one corresponds to (probably) more rhythmic list.
 rhythmicityPoly x0 r choices rhythm = similarityPoly 'a' x0 . getPolyChRhData 'a' r choices rhythm
@@ -676,8 +699,8 @@
   :: (Ord a) => Either.Either (Double -> Double -> Double) (Int -> Double -> Double -> Double)
   -> Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyGE f x0 r choices rhythm = similarityPolyGE f 'a' x0 . zip [0..] . getPolyChRhData 'a' r choices rhythm
@@ -687,8 +710,8 @@
  :: (Ord a) => (Int -> Double -> Double -> Double)
  -> Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
  -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
- -> PolyChoices
- -> PolyRhythmBasis
+ -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+ -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
  -> [a]
  -> Double
 rhythmicityPolyG1 f = rhythmicityPolyGE (Either.Right f)
@@ -698,8 +721,8 @@
  :: (Ord a) => (Double -> Double -> Double)
  -> Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
  -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
- -> PolyChoices
- -> PolyRhythmBasis
+ -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+ -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
  -> [a]
  -> Double
 rhythmicityPolyG12 f = rhythmicityPolyGE (Either.Left f)
@@ -712,8 +735,8 @@
   :: (Ord a) => Either.Either (Double -> Double -> Double) (Int -> Double -> Double -> Double)
   -> Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyGE0 f x0 r choices rhythm = similarityPolyGE0 f 'a' x0 . zip [0..] . getPolyChRhData 'a' r choices rhythm
@@ -723,8 +746,8 @@
  :: (Ord a) => (Int -> Double -> Double -> Double)
  -> Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
  -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
- -> PolyChoices
- -> PolyRhythmBasis
+ -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+ -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
  -> [a]
  -> Double
 rhythmicityPolyG01 f = rhythmicityPolyGE0 (Either.Right f)
@@ -734,8 +757,8 @@
  :: (Ord a) => (Double -> Double -> Double)
  -> Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
  -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
- -> PolyChoices
- -> PolyRhythmBasis
+ -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+ -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
  -> [a]
  -> Double
 rhythmicityPolyG02 f = rhythmicityPolyGE0 (Either.Left f)
@@ -748,8 +771,8 @@
 rhythmicityPoly0
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double -- ^ The greater one corresponds to (probably) more rhythmic list.
 rhythmicityPoly0 x0 r choices rhythm = similarityPoly0 'a' x0 . getPolyChRhData 'a' r choices rhythm
@@ -784,8 +807,8 @@
 rhythmicityPolyWeightedF2
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedF2 = rhythmicityPolyG12 (simpleF2)
@@ -794,8 +817,8 @@
 rhythmicityPolyWeightedF3
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedF3 = rhythmicityPolyG1 (simpleF3)
@@ -804,8 +827,8 @@
 rhythmicityPolyWeightedF20
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedF20 = rhythmicityPolyG02 (simpleF2)
@@ -814,8 +837,8 @@
 rhythmicityPolyWeightedF30
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedF30 = rhythmicityPolyG01 (simpleF3)
@@ -824,8 +847,8 @@
 rhythmicityPolyWeightedEF2
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedEF2 = rhythmicityPolyG12 (simpleEndF2)
@@ -834,8 +857,8 @@
 rhythmicityPolyWeightedEF3
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedEF3 = rhythmicityPolyG1 (simpleEndF3)
@@ -844,8 +867,8 @@
 rhythmicityPolyWeightedEF20
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedEF20 = rhythmicityPolyG02 (simpleEndF2)
@@ -854,8 +877,8 @@
 rhythmicityPolyWeightedEF30
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedEF30 = rhythmicityPolyG01 (simpleEndF3)
@@ -886,8 +909,8 @@
 rhythmicityPolyWeightedLF2
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedLF2 = rhythmicityPolyG12 (linearF2)
@@ -896,8 +919,8 @@
 rhythmicityPolyWeightedLF3
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedLF3 = rhythmicityPolyG1 (linearF3)
@@ -906,8 +929,8 @@
 rhythmicityPolyWeightedLF20
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedLF20 = rhythmicityPolyG02 (linearF2)
@@ -916,8 +939,8 @@
 rhythmicityPolyWeightedLF30
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedLF30 = rhythmicityPolyG01 (linearF3)
@@ -926,8 +949,8 @@
 rhythmicityPolyWeightedLEF2
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedLEF2 = rhythmicityPolyG12 (linearEndF2)
@@ -936,8 +959,8 @@
 rhythmicityPolyWeightedLEF3
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedLEF3 = rhythmicityPolyG1 (linearEndF3)
@@ -946,8 +969,8 @@
 rhythmicityPolyWeightedLEF20
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedLEF20 = rhythmicityPolyG02 (linearEndF2)
@@ -956,8 +979,8 @@
 rhythmicityPolyWeightedLEF30
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Int -- ^ If the argument is less or equal to 4, then 'Marker4s' is used, if it is greater than 4, then 'PolyMarkers' is used.
-  -> PolyChoices
-  -> PolyRhythmBasis
+  -> PolyChoices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> PolyRhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double
 rhythmicityPolyWeightedLEF30 = rhythmicityPolyG01 (linearEndF3)
@@ -999,11 +1022,11 @@
 Nevertheless, the further checks (e. g. 'validPolyChRhPair' or 'validChRhPair') is not applied by it, so
 they must be applied further during the usage. Examples of the usage:
 \"c114+112=2\" returns 'Just' @P1 (Ch 1 1 4) (Rhythm 1 1 2) 2@
-\"ctttff7+112111=7*3\" returns 'Just' @P2 (PolyCh [True,True,True,False,False] 7) (PolyRhythm [1,1,2,1,1,1]) 7 3@.
+\"Mtttff7+112111=7*3\" returns 'Just' @P2 (PolyCh [True,True,True,False,False] 7) (PolyRhythm [1,1,2,1,1,1]) 7 3@.
 -}
 readRhythmicity :: String -> Maybe ParseChRh
 readRhythmicity ys@(x:xs)
- | x == 'c' && not (null xs) = if
+ | ((x `elem` "cMN") || (x >= 'A' && x <= 'F')) && not (null xs) = if
                                 | isDigit . head $ xs -> let x = readMaybe (take 1 ts)::Maybe Int
                                                              y = readMaybe (drop 1 . take 2 $ ts)::Maybe Int
                                                              z = readMaybe (drop 2 ts)::Maybe Int
diff --git a/Rhythmicity/TwoFourth.hs b/Rhythmicity/TwoFourth.hs
--- a/Rhythmicity/TwoFourth.hs
+++ b/Rhythmicity/TwoFourth.hs
@@ -17,6 +17,14 @@
 
 import Data.List (sort)
 
+{-| The data type that is used to mark the syllables accordingly to
+their importance in general rhythm constituting. More important syllables
+are marked with the less data constuctors (since the data type has an
+instance of the 'Ord' type class). Can be used in case of three levels of
+importance for rhythm constituting
+with the last, third 'C' level of the syllables which position is thought as
+not significant (though it actually, is not, but for simplicity).
+-}
 data Marker3s = A | B | C deriving (Eq,Ord,Show)
 
 {-| Data to specify some quantitative information of the structure of rhythmicity.
@@ -63,7 +71,7 @@
 -}
 getChRhData
   :: (Ord a) => Choices
-  -> RhythmBasis
+  -> RhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> [[Marker3s]]
 getChRhData choice@(Ch n1 m1 l1) rhythm@(Rhythm p q l) xs
@@ -198,8 +206,8 @@
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Double -- ^ The positive factor (multiplier) coefficient that increases or decreases the result in case of 'A' simultaneous presence (absence).
   -> Double -- ^ The addition (positive subtraction) coefficient that increases or decreases (probably) the result in case of 'B' similtaneous presence (absence).
-  -> Choices
-  -> RhythmBasis
+  -> Choices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> RhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double -- ^ In case of positive previous 'Double' arguments this is a positive value. The greater one corresponds to (probably) more rhythmic list.
 rhythmicityABC x0 k1 k2 choices rhythm = similarityABC k1 k2 x0 . getChRhData choices rhythm
@@ -213,8 +221,8 @@
   :: (Ord a) => Double -- ^ The initial value starting from which it counts. Usually, equals to 1.0.
   -> Double -- ^ The positive factor (multiplier) coefficient that increases or decreases the result in case of 'A' simultaneous presence (absence).
   -> Double -- ^ The addition coefficient that increases the result in case of 'B' similtaneous presence.
-  -> Choices
-  -> RhythmBasis
+  -> Choices -- ^ Data specifies the structure of the period of rhythmicity -- whether maximum or minimum elements are considered and how many syllables costitute the period.
+  -> RhythmBasis -- ^ Data specifies the quantities of the syllables on the corresponding levels of importance.
   -> [a]
   -> Double -- ^ In case of positive previous 'Double' arguments this is a positive value. The greater one corresponds to (probably) more rhythmic list.
 rhythmicityABC0 x0 k1 k2 choices rhythm = similarityABC0 k1 k2 x0 . getChRhData choices rhythm
diff --git a/phonetic-languages-rhythmicity.cabal b/phonetic-languages-rhythmicity.cabal
--- a/phonetic-languages-rhythmicity.cabal
+++ b/phonetic-languages-rhythmicity.cabal
@@ -2,7 +2,7 @@
 -- For further documentation, see http://haskell.org/cabal/users-guide/
 
 name:                phonetic-languages-rhythmicity
-version:             0.9.0.0
+version:             0.9.1.0
 synopsis:            Allows to estimate the rhythmicity properties for the text
 description:         Allows to estimate (somewhat to say, evaluate) the rhythmicity properties for the text. Inspired by the ancient Greek and Latin poetry.
 
