diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index f6649fd191f..b3d4a80bc30 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -14,6 +14,11 @@ it is very important you follow these guidelines:
         <first line (up to ~80 characters)>
 
         <more paragraphs here>
+        
+    * The first line should have a prefix to give context
+      (unless context is really clear), such as:
+      
+          <keyword>: <message>
 
   * Be sure to **fill in** the pull-request template with
     meaningful content (be very descriptive, take your time).