* NOTMUCH_STATUS_SUCCESS: Message successfully added to database.
*
* NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID: Message has the same message
- * ID as another message already in the database. Nothing added
- * to the database.
+ * ID as another message already in the database. The new filename
+ * was successfully added to the message in the database.
*
* NOTMUCH_STATUS_FILE_ERROR: an error occurred trying to open the
* file, (such as permission denied, or file not found,