diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -10,5 +10,9 @@
 
 ## 0.2.0.0 -- 2020-06-09
 
-* Second version. Added a README.markdown file. Added new functions to the DobutokO.Sound.Faded module with 'N' ending to generalize the name(s) of the resulting 
+* Second version. Added new functions to the DobutokO.Sound.Faded module with 'N' ending to generalize the name(s) of the resulting 
 file(s). Some minor code improvements.
+
+## 0.2.1.0 -- 2020-06-09
+
+* Second version. Added a README.markdown file. 
diff --git a/README.markdown b/README.markdown
new file mode 100644
--- /dev/null
+++ b/README.markdown
@@ -0,0 +1,10 @@
+                     Model Explanation for DobutokO.Sound.Faded
+                     ==========================================
+
+[![Model Explanation](https://drive.google.com/file/d/1DUXtj-2YMMxc6wAmTcQS8Ub2czDFSOro)]
+(https://drive.google.com/file/d/1DUXtj-2YMMxc6wAmTcQS8Ub2czDFSOro)
+
+The line with dashes and dots for the different variants can be changed to the other 
+types of lines (not the linear ones), but if there is a t_{2} point as on the right 
+plot then its coordinates is preserved.
+
diff --git a/dobutokO4.cabal b/dobutokO4.cabal
--- a/dobutokO4.cabal
+++ b/dobutokO4.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                dobutokO4
-version:             0.2.0.0
+version:             0.2.1.0
 synopsis:            Helps to create experimental music. Uses SoX inside.
 description:         Uses SoX fade (in a special 2D way) and frequency modulation. Provides a special representation for the composition.
 homepage:            https://hackage.haskell.org/package/dobutokO4
@@ -13,7 +13,7 @@
 -- copyright:
 category:            Sound
 build-type:          Simple
-extra-source-files:  ChangeLog.md
+extra-source-files:  ChangeLog.md, README.markdown
 cabal-version:       >=1.10
 
 library