Add a missing entry on  the fix for issue #2790.
diff --git a/Misc/NEWS b/Misc/NEWS
index 3f2ceaa..6afdc5a 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,8 @@
 Core and Builtins
 -----------------
 
+- Issue #2790: sys.flags was not properly exposing its bytes_warning attribute.
+
 Extension Modules
 -----------------