howto: add suggestion that people upgrade notmuch.

diff --git a/howto.mdwn b/howto.mdwn
index fea9e522424c7356be1b048e56f3447213ae6ec0..77ce9b6febf0384cb2a2ed189096296ecbbbf340 100644 (file)
--- a/howto.mdwn
+++ b/howto.mdwn
@@ -50,7 +50,9 @@ various "third party" notmuch utilities.
 
   notmuch **since version 0.5** syncs maildir flags and respective
   tags in both directions. This part applies only to notmuch prior to
-  version 0.5:
+  version 0.5 (but please consider updating to a more recent version
+  of notmuch; in addition to maildir tag syncing, it contains many
+  useful new features, and several important bug fixes):
 
   Some IMAP users rely on maildir flags that convey the status "seen",
   "replied", "trashed", in order to synchronize the status of their