diff --git a/Misc/NEWS b/Misc/NEWS
index 456b1ef..0e90db2 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -23,6 +23,9 @@
 Library
 -------
 
+- Issue #6791: Limit header line length (to 65535 bytes) in http.client
+  and http.server, to avoid denial of services from the other party.
+
 - Issue #10404: Use ctl-button-1 on OSX for the context menu in Idle.
 
 - Issue #9907: Fix tab handling on OSX when using editline by calling