diff --git a/lib.go b/lib.go
index 478820a..c01444a 100644
--- a/lib.go
+++ b/lib.go
@@ -41,6 +41,12 @@ var acnQueue event.Queue
 var contactEventsQueue event.Queue
 var globalACN connectivity.ACN
 
+// ChatMessage API currently not officially documented, see
+// https://git.openprivacy.ca/cwtch.im/secure-development-handbook/issues/3
+// for latest updates for now
+//
+// A ChatMessage is the application-layer Cwtch message, delivered to the UI
+// as serialized json.
 type ChatMessage struct {
 	O int    `json:"o"`
 	D string `json:"d"`
@@ -529,6 +535,9 @@ func c_SendInvitation(profile_ptr *C.char, profile_len C.int, handle_ptr *C.char
 	SendInvitation(profile, handle, target)
 }
 
+// Send an invitation from `profileOnion` to contact `handle` (peer or group)
+// asking them to add the contact `target`  (also peer or group).
+// For groups, the profile must already have `target` as a contact.
 func SendInvitation(profileOnion, handle, target string) {
 	profile := application.GetPeer(profileOnion)
 	ph := utils.NewPeerHelper(profile)
@@ -547,14 +556,8 @@ func SendInvitation(profileOnion, handle, target string) {
 	inviteBytes, err := json.Marshal(invite)
 	if err != nil {
 		log.Errorf("malformed invite: %v", err)
-	} else if ph.IsGroup(handle) {
-		groupHandler, groupHandlerErr := groups.ExperimentGate(utils.ReadGlobalSettings().Experiments)
-		if groupHandlerErr == nil {
-			groupHandler.SendMessage(profile, handle, string(inviteBytes))
-		}
 	} else {
-		contactHandler, _ := contact.FunctionalityGate(utils.ReadGlobalSettings().Experiments)
-		contactHandler.SendMessage(profile, handle, string(inviteBytes))
+		SendMessage(profileOnion, handle, string(inviteBytes))
 	}
 }