SF 1193128: Let str.translate(None) be an identity transformation
diff --git a/Doc/lib/libstring.tex b/Doc/lib/libstring.tex
index bc1649f..055ac0c 100644
--- a/Doc/lib/libstring.tex
+++ b/Doc/lib/libstring.tex
@@ -419,7 +419,8 @@
Delete all characters from \var{s} that are in \var{deletechars} (if
present), and then translate the characters using \var{table}, which
must be a 256-character string giving the translation for each
- character value, indexed by its ordinal.
+ character value, indexed by its ordinal. If \var{table} is \code{None},
+ then only the character deletion step is performed.
\end{funcdesc}
\begin{funcdesc}{upper}{s}