diff --git a/readme.md b/readme.md
index e69d526..1567d65 100644
--- a/readme.md
+++ b/readme.md
@@ -99,6 +99,10 @@ export default {
 
 Default name for new leafnode.
 
+**default-expanded**
+
+Default node is expanded or not.
+
 # events
 **click**