Add a reference to the sha module, noting that SHA is considered more
secure. Suggested by Erno Kuusela <erno@iki.fi>.
diff --git a/Doc/lib/libmd5.tex b/Doc/lib/libmd5.tex
index 7400a2e..cf35c8c 100644
--- a/Doc/lib/libmd5.tex
+++ b/Doc/lib/libmd5.tex
@@ -70,3 +70,10 @@
efficiently compute the digests of strings that share a common initial
substring.
\end{methoddesc}
+
+
+\begin{seealso}
+ \seemodule{sha}{Similar module implementing the Secure Hash
+ Algorithm (SHA). The SHA algorithm is considered a
+ more secure hash.}
+\end{seealso}