diff --git a/src/gui/painting/qplatformbackingstore.cpp b/src/gui/painting/qplatformbackingstore.cpp
index 33d5e76e52bf324024d4d1847dd0c57e84ba0865..defdcfb4ad59549df5fd99d78546834c338950c9 100644
--- a/src/gui/painting/qplatformbackingstore.cpp
+++ b/src/gui/painting/qplatformbackingstore.cpp
@@ -226,7 +226,8 @@ void QPlatformTextureList::clear()
     Flushes the given \a region from the specified \a window onto the
     screen.
 
-    Note that the \a offset parameter is currently unused.
+    The \a offset parameter is relative to the origin of the backing
+    store image.
 */
 
 #ifndef QT_NO_OPENGL