diff --git a/README.md b/README.md
index 55168f5..086bb22 100644
--- a/README.md
+++ b/README.md
@@ -44,8 +44,9 @@ cp wallet.json.example wallet.json
   "rpc": "https://octra.network"
 }
 ```
+You need use B64 type private key.
 
-3. run
+4. run
 
 ```bash
 ./run.sh       # on linux/mac