--- a/plugins/mod_muc_mam.lua	Wed Apr 29 18:04:05 2020 +0200
+++ b/plugins/mod_muc_mam.lua	Fri May 08 22:39:01 2020 +0200
@@ -395,6 +395,7 @@
 
 module:hook("muc-disco#info", function(event)
 	event.reply:tag("feature", {var=xmlns_mam}):up();
+	event.reply:tag("feature", {var=xmlns_st_id}):up();
 end);
 
 -- Cleanup