diff --git a/src/designer/data/generate_header.xsl b/src/designer/data/generate_header.xsl
index 92d103031ca14bfb15ff155118eb8fffd38d7820..660e23d0894ff5d942a1e34725630bb5d159ea01 100644
--- a/src/designer/data/generate_header.xsl
+++ b/src/designer/data/generate_header.xsl
@@ -383,7 +383,7 @@
 // We mean it.
 //
 
-// THIS FILE IS AUTOMATICALLY GENERATED
+// THIS FILE IS AUTOMATICALLY GENERATED. DO NOT EDIT!
 
 #ifndef UI4_H
 #define UI4_H
diff --git a/src/designer/data/generate_impl.xsl b/src/designer/data/generate_impl.xsl
index 8e611a0f72862a5e6a1487848bbc33c0a3bf3757..b6474d523f2bf6e63abad8226bb97b02249f81bb 100644
--- a/src/designer/data/generate_impl.xsl
+++ b/src/designer/data/generate_impl.xsl
@@ -941,6 +941,9 @@
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
+
+// THIS FILE IS AUTOMATICALLY GENERATED. DO NOT EDIT!
+
 </xsl:text>
         <xsl:text>#include "ui4_p.h"&endl;</xsl:text>
         <xsl:text>&endl;</xsl:text>