Add \versionadded tag.
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index 5d3da24..638ed6b 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -1278,6 +1278,8 @@
resolve to directories. Set \var{followlinks} to True to visit directories
pointed to by symlinks, on systems that support them.
+\versionadded[The \var{followlinks} parameter]{2.6}
+
\begin{notice}
Be aware that setting \var{followlinks} to true can lead to infinite recursion
if a link points to a parent directory of itself. \function{walk()} does not