diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -51,3 +51,8 @@
 ## 0.5.2.0 -- 2021-08-04
 
 * Fifth version revised B. Added README.md file with conceptual description for the polyrhythmic ideas used in the moudules.
+
+## 0.5.3.0 -- 2021-08-07
+
+* Fifth version revised C. Improved the increasing and decreasing functions to reduce irregular and asymmetric
+behaviours for the polyrhythm module. Added the corresponding information to the README.md file.
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -40,6 +40,7 @@
 subsequences.
 
 To assess this, we introduce certain numerical functions
+(see the information below)
 that have regular behavior and allow us to determine
 whether the subsequences actually have elements that
 belong to the relevant corresponding subgroups in the
@@ -85,3 +86,13 @@
 rhythmic patterns that are often close to the lyrics in
 rap style. Therefore, this can be attributed to one of
 the direct applications of the library.
+
+ Increasing and Decreasing Functions
+ ===================================
+
+Since the 0.5.3.0 version the increasing and decreasing
+functions for the polyrhythmicity evaluation have become
+more similar to be more likewise the inverse one to
+another. This leads to that fact that these functions
+now are expected to be smoother for usage for the
+beginning of the line, its middle and its ending.
diff --git a/Rhythmicity/PolyRhythm.hs b/Rhythmicity/PolyRhythm.hs
--- a/Rhythmicity/PolyRhythm.hs
+++ b/Rhythmicity/PolyRhythm.hs
@@ -217,9 +217,9 @@
  -> Double
 increasingF n x
  | n <= 0 || x <= 0 = error $ "Rhythmicity.PolyRhythm.increasingF: not defined for the arguments. " ++ show n ++ " " ++ show x
- | x < 1 = int2Double (n + 1) - int2Double n * x
- | x <= 1.01 = x + (1.0 / int2Double n)
- | n == 1 = x + 1.0
+ | n == 1 = x + min (x * 0.25) 0.125
+ | x < 1 = x ** (1.0 / int2Double n)
+ | x <= 1.1 = x + 1.0 / int2Double n
  | otherwise = x ^ n
 
 decreasingF
@@ -228,9 +228,9 @@
  -> Double
 decreasingF n x
  | n <= 0 || x <= 0 = error $ "Rhythmicity.PolyRhythm.decreasingF: not defined for the arguments. " ++ show n ++ " " ++ show x
- | x < 1 = x / int2Double n
- | x <= 1.01 = x - (1.0 / int2Double n)
- | n == 1 = x - 0.5
+ | n == 1 = x - min (x * 0.25) 0.125
+ | x < 1 = x ** int2Double n
+ | x <= 1.1 = 1.0 / (x + 1.0 / int2Double n)
  | otherwise = x ** (1.0 / int2Double n)
 
 similarityF1
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:             0.5.2.0
+version:             0.5.3.0
 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.