diff --git a/Misc/NEWS b/Misc/NEWS
index def99aa..0ff81de 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -24,6 +24,9 @@
 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 #4188: Avoid creating dummy thread objects when logging operations