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-rw-r--r--src/gui/painting/qplatformbackingstore_qpa.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/gui/painting/qplatformbackingstore_qpa.cpp b/src/gui/painting/qplatformbackingstore_qpa.cpp
index 485190d301..ff7d91ccea 100644
--- a/src/gui/painting/qplatformbackingstore_qpa.cpp
+++ b/src/gui/painting/qplatformbackingstore_qpa.cpp
@@ -114,6 +114,9 @@ QWindow* QPlatformBackingStore::window() const
This function is called before painting onto the surface begins,
with the \a region in which the painting will occur.
+ \note A platform providing a backing store with an alpha channel
+ needs to properly initialize the region to be painted.
+
\sa endPaint(), paintDevice()
*/