diff --git a/handler.go b/handler.go
index fb2961b..d8baca6 100644
--- a/handler.go
+++ b/handler.go
@@ -347,7 +347,7 @@ func (api *API) collectionPutHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 			}
 		*/
 
-		// apply newM on orgM and record changes for db update
+		// apply newM on orgM and record changes for db update, only first level for now
 		changes := bson.M{}
 		newMStruct := reflect.Indirect(reflect.ValueOf(newM))
 		orgMStruct := reflect.Indirect(reflect.ValueOf(orgM))
@@ -355,7 +355,9 @@ func (api *API) collectionPutHandler(m mgocrud.ModelInterface) gin.HandlerFunc {
 			field := newMStruct.Field(i)
 			fieldT := newMStruct.Type().Field(i)
 
-			if field.Kind() == reflect.Ptr && !field.IsNil() {
+			if (field.Kind() == reflect.Ptr || field.Kind() == reflect.Slice) &&
+				!field.IsNil() {
+
 				// apply naming conventions of mgo for changeset
 				tag := fieldT.Tag.Get("bson")
 				if tag == "" && !strings.Contains(string(fieldT.Tag), ":") {