1 files changed, 5 insertions, 0 deletions
diff --git a/render/picturestr.h b/render/picturestr.h
index 1ea91201e..25969a622 100644
--- a/render/picturestr.h
+++ b/render/picturestr.h
@@ -349,7 +349,12 @@ typedef struct _PictureScreen {
     PictFilterAliasPtr		filterAliases;
     int				nfilterAliases;
 
+    /**
+     * Called immediately after a picture's transform is changed through the
+     * SetPictureTransform request.  Not called for source-only pictures.
+     */
     ChangePictureTransformProcPtr   ChangePictureTransform;
+
     ChangePictureFilterProcPtr	ChangePictureFilter;
     DestroyPictureFilterProcPtr	DestroyPictureFilter;