Regenerate docs
diff --git a/doc/html/openssl-x509.html b/doc/html/openssl-x509.html
index bd60d79..95f1a21 100644
--- a/doc/html/openssl-x509.html
+++ b/doc/html/openssl-x509.html
@@ -197,6 +197,9 @@
<dl><dt><b><a name='l2h-53'><tt class='method'>digest</tt></a></b>(<var>digest_name</var>)
<dd>
Return a digest of the certificate, using the <var>digest_name</var> method.
+<var>digest_name</var> must be a string describing a digest algorithm supported
+by OpenSSL (by EVP_get_digestbyname, specifically). For example,
+<tt class="constant">"md5"</tt> or <tt class="constant">"sha1"</tt>.
</dl>
<P>