diff --git a/Doc/lib/libstring.tex b/Doc/lib/libstring.tex
index 1f1a89e..a4823d9 100644
--- a/Doc/lib/libstring.tex
+++ b/Doc/lib/libstring.tex
@@ -264,7 +264,7 @@
 must be a string; the characters in the string will be stripped from
 the both ends of the string this method is called on.
 \versionchanged[The \var{chars} parameter was added.  The \var{chars}
-parameter cannot be passed in 2.2 or 2.2.1]{2.2.2}
+parameter cannot be passed in earlier 2.2 versions]{2.2.3}
 \end{funcdesc}
 
 \begin{funcdesc}{swapcase}{s}