diff --git a/README.md b/README.md
index e620ec0..b029c97 100644
--- a/README.md
+++ b/README.md
@@ -4,3 +4,5 @@ Following https://interpreterbook.com/
 
 
 All code belongs to Thorsten Bell as it's written directly from the book.
+
+`go run main.go`  or `go test ./lexer`