diff --git a/ActivityStreams.md b/ActivityStreams.md
index fcbeb4d..e197d3f 100644
--- a/ActivityStreams.md
+++ b/ActivityStreams.md
@@ -11,6 +11,18 @@ See http://activitystrea.ms/head/activity-schema.html
 * http://purl.org/macgirvin/dfrn/1.0/dislike
 * Description: dislike a message ("I don't like the post")
 
+## ACTIVITY_ATTEND
+* http://purl.org/zot/activity/attend
+* Description: attend an event
+
+## ACTIVITY_ATTENDNO
+* http:http://purl.org/zot/activity/attendno
+* Description: don't attend an event
+
+## ACTIVITY_ATTENDMAYBE
+* http://purl.org/zot/activity/attendmaybe
+* Description: attend maybe an event
+
 ## ACTIVITY_FRIEND
 * http://activitystrea.ms/schema/1.0/make-friend
 * Description: someone started to share with user (mostly OStatus)