From 10dbdaa6780eb3ccc26014d32093dfecc1886778 Mon Sep 17 00:00:00 2001
From: Robin Dunn <robin@alldunn.com>
Date: Fri, 7 Aug 2020 14:28:48 -0700
Subject: [PATCH] Add a note about the sizer item flags validation to the
 Migration Guide

---
 docs/MigrationGuide.rst | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/docs/MigrationGuide.rst b/docs/MigrationGuide.rst
index efccec36..492f1dc5 100644
--- a/docs/MigrationGuide.rst
+++ b/docs/MigrationGuide.rst
@@ -711,6 +711,17 @@ override `InitLocale` if needed.
 
 
 
+Sizer item flags validation
+---------------------------
+
+Starting with wxPython 4.1, wxWidgets is now validating the flags passed
+when adding items to a sizer, to ensure that they are the correct flags for
+the type of the sizer. If the given flags do not make sense, for example using
+horizontal alignment flags in a horizontal box sizer, then a wxAssertionError
+error is raised.
+
+
+
 .. toctree::
    :maxdepth: 2
    :hidden: