diff --git a/docs/CONTRIBUTING b/docs/CONTRIBUTING
index 1ad6a08a3a..50c57dfebc 100644
--- a/docs/CONTRIBUTING
+++ b/docs/CONTRIBUTING
@@ -27,6 +27,10 @@ Names
 Variables and function names should be all lower case.
 Preprocessor symbols should be all uppercase.
 
+Comments
+--------
+We only use plain old /* C standard comments */.
+
 Style
 -----
 When changing code, follow the code style of the file you are editing.