1 files changed, 3 insertions, 1 deletions
diff --git a/g10/sign.c b/g10/sign.c
index e4fcc5f34..fe242b8da 100644
--- a/g10/sign.c
+++ b/g10/sign.c
@@ -1165,7 +1165,9 @@ make_keysig_packet( PKT_signature **ret_sig, PKT_public_key *pk,
     /* If you are making a signature on a v4 key using your v3 key, it
        doesn't make sense to generate a v3 sig.  After all, no v3-only
        PGP implementation could understand the v4 key in the first
-       place. */
+       place.  Note that this implies that a signature on an attribute
+       uid is usually going to be v4 as well, since they are not
+       generally found on v3 keys. */
     if (sigversion < pk->version)
         sigversion = pk->version;