diff --git a/generateAppend.go b/generateAppend.go
index ac53974..df705f7 100644
--- a/generateAppend.go
+++ b/generateAppend.go
@@ -18,12 +18,12 @@ func (msg *MsgName) simpleAppend(w io.Writer, FRUIT, APPLES, APPLE string) strin
 
 	// log.Printf("\t\t(x %s) APPEND(%s)\n", FRUIT, APPLE)
 	// append -- no check at all
-	fmt.Fprintln(w, "// just a simple Append() shortcut (but still uses the mutex lock)")
+	fmt.Fprintln(w, "// a Append() shortcut (that does Clone() with a mutex) notsure if it really works")
 	fmt.Fprintln(w, funcdef, "{")
 	fmt.Fprintln(w, "	"+LOCK+".Lock()")
 	fmt.Fprintln(w, "	defer "+LOCK+".Unlock()")
 	fmt.Fprintln(w, "")
-	fmt.Fprintln(w, "	x."+APPLES+" = append(x."+APPLES+", y)")
+	fmt.Fprintln(w, "	x."+APPLES+" = append(x."+APPLES+", proto.Clone(y).(*"+APPLE+"))")
 	fmt.Fprintln(w, "}")
 	fmt.Fprintln(w, "")
 
@@ -92,7 +92,7 @@ func (msg *MsgName) addAppendBy(w io.Writer, STRUCT, FUNCNAME, STRUCTVAR, VARNAM
 	fmt.Fprintln(w, "		}")
 	fmt.Fprintln(w, "	}")
 	fmt.Fprintln(w, "")
-	fmt.Fprintln(w, "	x."+STRUCTVAR+" = append(x."+STRUCTVAR+", y)")
+	fmt.Fprintln(w, "	x."+STRUCTVAR+" = append(x."+STRUCTVAR+", proto.Clone(y).(*"+VARTYPE+"))")
 	fmt.Fprintln(w, "	return true")
 	fmt.Fprintln(w, "}")
 	fmt.Fprintln(w, "")