Backport of r64677.
diff --git a/Misc/NEWS b/Misc/NEWS
index ebaefd4..c8fbedf 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -117,6 +117,8 @@
 Tests
 -----
 
+- Issue #3261: test_cookielib had an improper file encoding specified.
+
 - Patch #2232: os.tmpfile might fail on Windows if the user has no
   permission to create files in the root directory.