diff --git a/Makefile b/Makefile
index c35170d..d78ea40 100644
--- a/Makefile
+++ b/Makefile
@@ -33,6 +33,10 @@ cover:  ## Run the tests.
 	@go test -coverprofile=coverage.o
 	@go tool cover -func=coverage.o
 
+.PHONY: generate
+generate: ## Run go generate
+	@go generate ./...
+
 .PHONY: build
 build: ## Build example command lines.
 	./_example/build.sh
diff --git a/key.go b/key.go
index 068b70e..7ba569c 100644
--- a/key.go
+++ b/key.go
@@ -1,9 +1,10 @@
-// Code generated "This is a fake comment to avoid golint errors"; DO NOT EDIT.
-// FIXME: This is a little bit stupid, but there are many public constants which is no value for writing godoc comment.
+// Code generated by hand; DO NOT EDIT.
+// This is a little bit stupid, but there are many public constants which is no value for writing godoc comment.
 
 package prompt
 
 // Key is the type express the key inserted from user.
+//go:generate stringer -type=Key
 type Key int
 
 // ASCIICode is the type contains Key and it's ascii byte array.