X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=notmuch.h;h=f568bc0a2da3458fad66b6b13f03d7fadb267f24;hp=57ff8c8f3003fd63298ca7acd9464399ffe9262b;hb=ce5d78296251b529838df0dbd4dc3b9a90030924;hpb=868d3b30683e40af723a8c94141172bd78d2b118

diff --git a/notmuch.h b/notmuch.h
index 57ff8c8f..f568bc0a 100644
--- a/notmuch.h
+++ b/notmuch.h
@@ -338,6 +338,10 @@ notmuch_results_destroy (notmuch_results_t *results);
  * modified by the caller and will only be valid for as long as the
  * message is valid, (which is until the query from which it derived
  * is destroyed).
+ *
+ * This function will not return NULL since Notmuch ensures that every
+ * message has a unique message ID, (Notmuch will generate an ID for a
+ * message if the original file does not contain one).
  */
 const char *
 notmuch_message_get_message_id (notmuch_message_t *message);