diff --git a/Misc/NEWS b/Misc/NEWS
index 4ec9c53..a227df8 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -9,6 +9,9 @@
 Core and Builtins
 -----------------
 
+- Issue #14850: Now a chamap decoder treates U+FFFE as "undefined mapping"
+  in any mapping, not only in an unicode string.
+
 - Issue #11461: Fix the incremental UTF-16 decoder. Original patch by
   Amaury Forgeot d'Arc.