Bug #1373197: note that os.makedirs does not work with '..'
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index 48cda9b..148d2da 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -877,6 +877,8 @@
directory already exists or cannot be created. The default \var{mode}
is \code{0777} (octal). On some systems, \var{mode} is ignored.
Where it is used, the current umask value is first masked out.
+\note{\function{makedirs()} will become confused if the path elements
+to create include \var{os.pardir}.}
\versionadded{1.5.2}
\versionchanged[This function now handles UNC paths correctly]{2.3}
\end{funcdesc}