diff --git a/README.md b/README.md
index b4510e4..65dc5e9 100644
--- a/README.md
+++ b/README.md
@@ -8,4 +8,5 @@ Command line:
 secure-editor-rs <file-name> <algorithm> <key-hex> <nonce-hex>
 ```
 
-> `<algorithm>` is always `aes-256-gcm`
+> `<algorithm>` is always `aes-256-gcm`<br>
+> Exit `0` when success, otherwise return none `0`