diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -47,3 +47,7 @@
 
 * Fifth version revised A. Fixed issues with fixed point 1.0 for increasing and decreasing functions in the module
 Rhythmicity.PolyRhythm. 
+
+## 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.
diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,87 @@
+ Polyrhythm as a Multi-Ordered Sequence Pattern
+ ==============================================
+
+Let us have some sequence organized in the following way.
+Let us implement (generally speaking a conditional one)
+division of the sequence into compact single-connected
+subgroups with the same number of elements each in the
+subgroup, which actually means that we split the sequence
+into a sequence of subsequences with the same number of
+elements in each. Consider the internal ordering of each
+subsequence from the perspective of the placement of the
+values ​​of its elements and repeatability of the some
+patterns of the placement of the elements.
+We assume that the elements can be compared in relation of
+order, that is, they are the elements of the data type
+that has an implemented instance of the class Ord.
+
+Considering that the elements of the subsequences may be
+pairwise different (or in some cases equal), we will
+compare the positions on which the subgroups of elements
+that have a higher degree of relatedness ("closeness",
+"similarity") in value and order are located.
+Denote such subgroups by indices that have in the module
+code mostly a letter designation.
+
+Then each subsequence will consist of the same number of
+elements of one nature (in particular, numbers of the 
+type Double), in each subsequence there will be selected
+several subgroups of "similar" elements in value (and
+order, if the subsequences are sorted by the value),
+each of which will have its own index as a symbol 
+(most often in the code -- the characters). Subgroups must
+have (actually approximately) the same number of elements
+(in the code it is not strictly used for simplification
+of the former one, but it is so in the vast majority of
+cases because of the excessive "accuracy" of numbers of
+type Double that are used). Consider the question of
+positions in the subsequences of the corresponding
+subgroups in case of they have been belonging to different
+subsequences.
+
+To assess this, we introduce certain numerical functions
+that have regular behavior and allow us to determine
+whether the subsequences actually have elements that
+belong to the relevant corresponding subgroups in the
+same places, or on different ones. It can be shown that
+the situation "on different ones" corresponds to the
+presence of several rhythmimc patterns - for each subgroup
+will be their own, which do not mutually match, at the
+same time the ideal situation "completely in the same places"
+corresponds to the case when these rhythms are consistent
+with each other, as is the case of coherence in quantum
+physics, in particular spatial and temporal coherence,
+which is important in particular for understanding of
+lasers and masers. Polyrhythms consisting of such
+rhythms, which cohere with each other, form a more
+noticeable overall rhythm, as well as the presence of
+coherence in the radiation leads to a more structured
+latter one.
+
+ Coherent States of Polyrhythmicity as One of the Essential Sources of Rhythmicity
+ =================================================================================
+
+The described pattern of rhythmicity is one of the
+significant possible options for the formation of
+rhythmicity in particular in lyrics or music, but not the
+only one. It should be noted that the described mechanism
+of rhythm formation, as is noticed in the statistical
+experiments with texts using this code (the code of the
+library and its dependent packages on the Hackage site)
+may not be the only possible option, but in many cases it
+is crucial and influences the course of the rhythmization
+process (formation, change or disappearance of the
+rhythm). It is also known that the presence of the 
+statistical relationship does not mean the existence of
+deeper connections between phenomena, in particular --
+the causality. "Correlation does not mean causality."
+A deeper connection implies the presence of other than the
+statistical ones to confirm it.
+
+ Rap Music Consequences
+ =====================
+
+The code of the library allows in practice to obtain
+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.
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:             0.5.1.0
+version:             0.5.2.0
 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.
 
@@ -14,7 +14,7 @@
 copyright:           Oleksandr Zhabenko
 category:            Language,Math,Data,Game
 build-type:          Simple
-extra-source-files:  CHANGELOG.md
+extra-source-files:  CHANGELOG.md, README.md
 cabal-version:       >=1.10
 
 library