diff --git a/Misc/NEWS b/Misc/NEWS
index 0774988..b567ad1 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -11,6 +11,7 @@
 
 Core and Builtins
 -----------------
+
 - Implement PEP 378, Format Specifier for Thousands Separator, for
   integers.
 
@@ -128,6 +129,8 @@
 Extension Modules
 -----------------
 
+- Issue #5391: mmap now deals exclusively with bytes.
+
 - Issue #5463: In struct module, remove deprecated overflow wrapping
   when packing an integer: struct.pack('=L', -1) now raises
   struct.error instead of returning b'\xff\xff\xff\xff'.  The