update contribution guidelines.

Mention emacs-keybindings.org, relax a bit about NEWS.

diff --git a/contributing.mdwn b/contributing.mdwn
index 473de8fcbdb5be647bb167f142c9d9e4bc0fcf1c..a5bbfb3dd6e390ef8fb945d437f27ed6d7ea3fcc 100644 (file)
--- a/contributing.mdwn
+++ b/contributing.mdwn
@@ -112,11 +112,17 @@ Notmuch source.
 If you modify or add new features to the Notmuch Emacs UI, you should
 update the Emacs documentation.
 
+If you add a new keybinding, update `devel/emacs-keybindings.org`. As
+much as possible, try to be consistent between modes.
+
 ## Update NEWS
 
 If you make user visible changes, you should add an entry to the
 [`NEWS`](https://git.notmuchmail.org/git/notmuch/blob/HEAD:/NEWS) file.
 
+In practice adding NEWS items can be done later during the release
+process, but then you typically get a one line mention, if at all.
+
 ## Update command-line completion
 
 If you modify or add new features to the Notmuch command-line tools, it