diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -35,3 +35,6 @@
 
 * Second version revised B. Added a new function mapI3. 
 
+## 0.2.2.1 -- 2019-11-08
+
+* Second version revised C. Fixed documentation. 
diff --git a/Data/List/InnToOut.hs b/Data/List/InnToOut.hs
--- a/Data/List/InnToOut.hs
+++ b/Data/List/InnToOut.hs
@@ -13,6 +13,7 @@
     -- * Operation to apply a function that creates an inner list to an element of the outer list   
        mapI
        , mapI2
+       , mapI3
   ) where
 
 -- | Function that applies additional function @f :: a -> [a]@ to @a@ if @p a = True@
diff --git a/mmsyn5.cabal b/mmsyn5.cabal
--- a/mmsyn5.cabal
+++ b/mmsyn5.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                mmsyn5
-version:             0.2.2.0
+version:             0.2.2.1
 synopsis:            Various additional operations on lists
 description:         A small library to deal with a little bit more complex operations on lists than Data.List module
 homepage:            http://hackage.haskell.org/package/mmsyn5