diff --git a/core/group_party.go b/core/group_party.go
index 1097759..0b0da18 100644
--- a/core/group_party.go
+++ b/core/group_party.go
@@ -501,6 +501,24 @@ func (gp *groupParty) InviteToParty(w http.ResponseWriter, r *http.Request) {
 	})
 }
 
+func (gp *groupParty) UpdatePartyMemberDocument(w http.ResponseWriter, r *http.Request) {
+	var doc struct {
+		Gid      string
+		Tid      string
+		Fragment bson.M
+	}
+	if err := gocommon.MakeDecoder(r).Decode(&doc); err != nil {
+		logger.Println("UpdatePartyMemberDocument failed. DecodeGob returns err :", err)
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+
+	gidobj, _ := primitive.ObjectIDFromHex(doc.Gid)
+	mid := midFromTid(gidobj, doc.Tid)
+
+	gp.updateMemberDocument(gidobj, mid, doc.Fragment)
+}
+
 func (gp *groupParty) AcceptPartyInvitation(w http.ResponseWriter, r *http.Request) {
 	var doc struct {
 		Gid       primitive.ObjectID