3 files changed, 33 insertions, 0 deletions
diff --git a/src/corelib/tools/qcollator_p.h b/src/corelib/tools/qcollator_p.h
index 50e1a01f82..526521ebf4 100644
--- a/src/corelib/tools/qcollator_p.h
+++ b/src/corelib/tools/qcollator_p.h
@@ -43,6 +43,17 @@
 #ifndef QCOLLATOR_P_H
 #define QCOLLATOR_P_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "qcollator.h"
 #include <QVector>
 #ifdef QT_USE_ICU
diff --git a/src/corelib/tools/qsimd_p.h b/src/corelib/tools/qsimd_p.h
index e1c22bac71..b8dd3b101e 100644
--- a/src/corelib/tools/qsimd_p.h
+++ b/src/corelib/tools/qsimd_p.h
@@ -42,6 +42,17 @@
 #ifndef QSIMD_P_H
 #define QSIMD_P_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include <qglobal.h>
 #include <qatomic.h>
 
diff --git a/src/corelib/tools/qstringiterator_p.h b/src/corelib/tools/qstringiterator_p.h
index c3986f0477..4ae705b085 100644
--- a/src/corelib/tools/qstringiterator_p.h
+++ b/src/corelib/tools/qstringiterator_p.h
@@ -43,6 +43,17 @@
 #ifndef QSTRINGITERATOR_H
 #define QSTRINGITERATOR_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include <QtCore/qstring.h>
 
 QT_BEGIN_NAMESPACE