* 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).
+ * This function will return NULL if triggers an unhandled Xapian
+ * exception.
*/
const char *
notmuch_message_get_message_id (notmuch_message_t *message);