diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 4c580b8..5f184fc 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -119,3 +119,7 @@ Header files are composed of sections. The order of sections is fixed. Every hea
 
 #endif
 ```
+
+## Semantics
+
+The build process must not yield any warnings.