Issue #21811: Add Misc/NEWS entry.
diff --git a/Misc/NEWS b/Misc/NEWS
index f31c132..40862a0 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -152,6 +152,11 @@
 
 - Issue #20635: Added tests for Tk geometry managers.
 
+Build
+-----
+
+- Issue #21811: Anticipated fixes to support OS X versions > 10.9.
+
 Windows
 -------