diff --git a/HACKING b/HACKING
index c6f8d036..4f35a537 100644
--- a/HACKING
+++ b/HACKING
@@ -9,6 +9,7 @@ quality of the code.
      1.2. Unit tests
      1.3. CVS
      1.4. ChangeLog
+     1.5. Warnings
 2. Style, indentation and braces
      2.1. Indentation
      2.2. Brace position
@@ -67,6 +68,12 @@ ChangeLog must be updated when a major change has occured. It is not required
 Each ChangeLog entry must have an author and a date.
 
 
+1.5. Warnings
+-------------
+
+The code should compile WITHOUT ANY WARNING, even those for unused parameters!
+
+
 
 2. Style, indentation and braces
 ================================