Add release note for GL #5099

diff --git a/doc/notes/notes-9.21.4.rst b/doc/notes/notes-9.21.4.rst
index b78768a16dd9fb3cca49ef1a3d821c43fd0a1fa3..34d08723dc84975c63458d78f92d4fce0d053823 100644 (file)
--- a/doc/notes/notes-9.21.4.rst
+++ b/doc/notes/notes-9.21.4.rst
@@ -86,6 +86,12 @@ New Features
   50. This allows :any:`named` to send a few more queries
   while looking up a single name. :gl:`#4980` :gl:`#4921`
 
+- Use the Server Name Indication (SNI) extension for all outgoing TLS
+  connections.
+
+  This improves compatibility with other DNS server software.
+  :gl:`#5099`
+
 Removed Features
 ~~~~~~~~~~~~~~~~