diff --git a/docs/topics/http/sessions.txt b/docs/topics/http/sessions.txt
index 8b4aec5300..b70e14acbb 100644
--- a/docs/topics/http/sessions.txt
+++ b/docs/topics/http/sessions.txt
@@ -640,6 +640,7 @@ behavior:
 * :setting:`SESSION_EXPIRE_AT_BROWSER_CLOSE`
 * :setting:`SESSION_FILE_PATH`
 * :setting:`SESSION_SAVE_EVERY_REQUEST`
+* :setting:`SESSION_SERIALIZER`
 
 .. _topics-session-security: