openssl rehash: document -compat
Fixes
@@ -99,6 +99,12 @@ Note that current versions will not use the old style.
Do not remove existing links.
This is needed when keeping new and old-style links in the same directory.
+=item B<-compat>
+
+Generate links for both old-style (MD5) and new-style (SHA1) hashing.
+This allows releases before 1.0.0 to use these links along-side newer
+releases.
+
=item B<-v>
Print messages about old links removed and new links created.
