diff --git a/README.md b/README.md
index c8607d0..614cbb9 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,6 @@
 
 # how to use
 
-Run `mix escript.build` and it will generate `smalc.exe`. Use `smalc filename` to run a file, or `smalc eval "code"` to evaluate an expression, or `smalc repl` for a repl. 
+Run `mix escript.build` and it will generate `smalc.exe`. Use `smalc filename` to run a file, or `smalc -eval "code"` to evaluate an expression, or `smalc -repl` for a repl. 
 
-Run `smalc help` for the help guide.
+Run `smalc -help` for the help guide.