diff --git a/doc/libmicrohttpd.texi b/doc/libmicrohttpd.texi
index 4424337f..d9d53dd7 100644
--- a/doc/libmicrohttpd.texi
+++ b/doc/libmicrohttpd.texi
@@ -2329,6 +2329,10 @@ Set of actions to be performed on upgraded connections.  Passed as an argument t
 @table @code
 @item MHD_UPGRADE_ACTION_CLOSE
 Closes the connection.  Must be called once the application is done with the client.  Takes no additional arguments.
+@item MHD_UPGRADE_ACTION_CORK_ON
+Enable corking on the underlying socket.
+@item MHD_UPGRADE_ACTION_CORK_OFF
+Disable corking on the underlying socket.
 
 @end table
 @end deftp