diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7b5c6dc..10b9862 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -11,11 +11,13 @@ If you want to contribute, please keep a few simple rules in mind:
 - One commit per fix/addition.
 - The short commit message shouldn't be longer than 50 characters.
 - The short commit message must start with an uppercase character.
-- The short commit message must start with the affected section followed by a
-  colon (if it affects any section).
+- The short commit message must start with the affected section or file followed
+  by a colon.
 - The short commit message must use the
   [imperative](https://en.wikipedia.org/wiki/Imperative_mood).
 - The short commit message mustn't end with a `.`.
+- The short commit message can be simply "Grammar" or "Typo", if the patch
+  fixes, well, grammar or typos.
 - It's always a good idea to have a look at other commits to get an idea how to
   format one's own commits messages.