diff --git a/doc/gpg.sgml b/doc/gpg.sgml
index 0eec90bad..caefc3292 100644
--- a/doc/gpg.sgml
+++ b/doc/gpg.sgml
@@ -1303,8 +1303,8 @@ Reset the --force-v3-sigs option.
 <varlistentry>
 <term>--force-v4-certs</term>
 <listitem><para>
-Always use v4 key signatures even on v3 version keys.  This make the
-signature unusable for PGP 2.
+Always use v4 key signatures even on v3 keys.  This option does also
+change the default hash algorithm for v3 RSA keys from MD5 to SHA-1.
 </para></listitem></varlistentry>
 
 <varlistentry>