diff --git a/src/app/node_spec.ts b/src/app/node_spec.ts
index 78e195f..e568e96 100644
--- a/src/app/node_spec.ts
+++ b/src/app/node_spec.ts
@@ -43,7 +43,7 @@ export type IconStyle = 'normal'|'inverted';
 /**
  * Modifiers that can be applied to a `DagNode` or `DagGroup`
  */
-export type NodeModifier = 'deleted';
+export type NodeModifier = 'deleted'|'added'|'changed';
 
 /**
  * Arbitrary key value storage per node