openssl rehash: document -compat

Fixes #5902

Reviewed-by: Andy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5937)

(cherry picked from commit adaf3cfad2319fe5c0d6fe179c726cc85eebf2d3)

diff --git a/doc/apps/rehash.pod b/doc/apps/rehash.pod
index 79268d47926cdfa3e024d905021771e1cbbd5ccf..0a192e91e5b365deb049d2117cb451a4e0197efa 100644 (file)
--- a/doc/apps/rehash.pod
+++ b/doc/apps/rehash.pod
@@ -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.