diff --git a/src/js/Readme.md b/src/js/Readme.md
index 6f7cc8f..642e3c0 100644
--- a/src/js/Readme.md
+++ b/src/js/Readme.md
@@ -2,6 +2,10 @@
 
 Basic implementation for blockchain in node.js, supporting pow, pos, pbft, dpos and pbft+dpos.
 
+Persistence is on top of leveldb.
+
+Support UTXO transactions.
+
 Tests passed on Ubuntu and MAC.
 
 ```