diff --git a/activitystreams/activity.go b/activitystreams/activity.go
index aab4c9f..13ffcee 100644
--- a/activitystreams/activity.go
+++ b/activitystreams/activity.go
@@ -112,6 +112,7 @@ type Object struct {
 	Name         string            `json:"name,omitempty"`
 	Content      string            `json:"content"`
 	ContentMap   map[string]string `json:"contentMap,omitempty"`
+	Tag          []Tag             `json:"tag"`
 }
 
 // NewNoteObject creates a basic Note object that includes the public
diff --git a/activitystreams/tag.go b/activitystreams/tag.go
new file mode 100644
index 0000000..63fe4c4
--- /dev/null
+++ b/activitystreams/tag.go
@@ -0,0 +1,14 @@
+package activitystreams
+
+type Tag struct {
+	Type TagType `json:"type"`
+	HRef string  `json:"href"`
+	Name string  `json:"name"`
+}
+
+type TagType string
+
+const (
+	TagHashtag TagType = "Hashtag"
+	TagMention         = "Mention"
+)