+ If you are missing messages which are tagged in the nmbug
+ repository, `nmbug status` will complain with U-prefixed lines and
+ you will have to jump through some hoops to create commits that
+ alter tags for those messages. Most other nmbug operation will be
+ unaffected.
+
+1. Install and use nmbug from notmuch version **0.19** or newer, and
+ either Python 2.7 or anything from the 3.x line.
+
+ The nmbug script is available in [devel/nmbug][nmbug].