backporting Fred's doc fix.

diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index 1785947e86ab0f8088e89790b02c61d875a77b5a..fcc172f81b38ee49e01d4ed6d12b31b3b9c82a31 100644 (file)
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -1335,8 +1335,9 @@ backslash.
 \end{datadesc}
 
 \begin{datadesc}{extsep}
-The character which separates the base filename from the extension,
-e.g. \character{.} in \code{os.py}.
+The character which separates the base filename from the extension;
+for example, the \character{.} in \code{os.py}.
+\versionadded{2.2}
 \end{datadesc}
 
 \begin{datadesc}{pathsep}