diff --git a/generator.py b/generator.py
index 30a4c2322..4726f8ded 100644
--- a/generator.py
+++ b/generator.py
@@ -5,7 +5,9 @@ def generateElements(elementFiles, outputCpp, outputH):
 	elementClasses = {}
 	baseClasses = {}
 
-	elementHeader = """#ifndef ELEMENTCLASSES_H
+	elementHeader = """// This file is automatically generated by generator.py
+
+#ifndef ELEMENTCLASSES_H
 #define ELEMENTCLASSES_H
 
 #include <vector>