diff --git a/README.md b/README.md
index c5e12d1..17dc4b5 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,11 @@
 # secure-editor-rs
 
-Secure Editor Rust edition
\ No newline at end of file
+Secure Editor Rust edition
+
+
+Command line:
+```shell
+secure-editor-rs <file-name> <algorithm> <key-hex> <nonce-hex>
+```
+
+> <algorithm> is always `aes-256-gcm`