PYTHON-5272 Add changelog entry for TLS session resumption

blink1073 · blink1073 · commit 04733ea90617 · 2026-06-10T13:26:35.000-05:00
diff --git a/doc/changelog.rst b/doc/changelog.rst
@@ -1,6 +1,14 @@
 Changelog
 =========
 
+Changes in Version 4.18.0
+------------------------
+
+- Improved TLS connection performance by reusing TLS sessions across connections
+  to the same server, avoiding a full handshake on each new connection.
+  Session reuse is active on the sync path unconditionally, and on the async
+  path when running Python 3.11 or later.
+
 Changes in Version 4.17.0 (2026/04/20)
 --------------------------------------
 
