Update link to the FIPS PUB 180-1 (PDF is available, but not PostScript).
diff --git a/Doc/lib/libsha.tex b/Doc/lib/libsha.tex
index 6c2c640..d8a5c26 100644
--- a/Doc/lib/libsha.tex
+++ b/Doc/lib/libsha.tex
@@ -53,6 +53,6 @@
\citetitle[http://csrc.nist.gov/fips/fip180-1.txt]{Secure
Hash Standard}, published in April of 1995. It is
available online as plain text (at least one diagram was
- omitted) and as PostScript at
- \url{http://csrc.nist.gov/fips/fip180-1.ps}.}
+ omitted) and as PDF at
+ \url{http://csrc.nist.gov/fips/fip180-1.pdf}.}
\end{seealso}