diff --git a/CHANGELOG b/CHANGELOG
index 6d7a237..1c95266 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,7 +1,9 @@
-version 2.6
+Version 2.5.1
 
 	New extra ponies: sealyra
 
+	Build system as compatibility with standard GNU Make build system.
+
 
 Version 2.5
 
diff --git a/manuals/ponysay.texinfo b/manuals/ponysay.texinfo
index 5f799df..f224927 100644
--- a/manuals/ponysay.texinfo
+++ b/manuals/ponysay.texinfo
@@ -1700,11 +1700,13 @@ sequences.
 @cindex versions
 @cindex previous releases
 
-@heading Version 2.6
+@heading Version 2.5.1
 
 @itemize @bullet
 @item
 New extraponies: @file{sealyra}
+@item
+Build system as compatibility with standard GNU Make build system.
 @end itemize