contrib-guide.md: add note about committing

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>

diff --git a/contrib-guide.md b/contrib-guide.md
index 0293c4d83c899824e5c8255ddbb3866f7d337e59..456c120802282fd7189eb7d12d49bb013ad0144f 100644 (file)
--- a/contrib-guide.md
+++ b/contrib-guide.md
@@ -227,3 +227,12 @@ consistent as possible:
   * Keep the text as impersonal as possible (minimize the use of
     _I_, _we_, _us_, etc.), except for user guides/tutorials where
     _we_ have an ongoing example.
+
+
+committing
+----------
+
+If you make a change to a single contents file, prefix your Git commit
+message's first line with the file ID followed by `: `, e.g:
+
+    archlinux: minor fix