diff --git a/src/imports/qtcanvas3d/doc/src/qtcanvas3d.qdoc b/src/imports/qtcanvas3d/doc/src/qtcanvas3d.qdoc
index 9a88ff6f5415875cbfdf90d280effba915548b4b..d98409b9dd126debbe3b504d67aa8c4cd0ca89d5 100644
--- a/src/imports/qtcanvas3d/doc/src/qtcanvas3d.qdoc
+++ b/src/imports/qtcanvas3d/doc/src/qtcanvas3d.qdoc
@@ -202,5 +202,7 @@
  *      attributes or the buffers they point to.
  *
  *      \li Enabling the stencil context attribute also forces the depth attribute to be enabled.
+ *
+ *      \li Disabling alpha context attribute does not work on some platforms.
  * \endlist
  */