diff --git a/Misc/NEWS b/Misc/NEWS
index 30668e6..c97daca 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
 Core and Builtins
 -----------------
 
+- Issue #4797: IOError.filename was not set when _fileio.FileIO failed to open
+  file with `str' filename on Windows.
+
 - Issue #3680: Reference cycles created through a dict, set or deque iterator
   did not get collected.