diff --git a/README.md b/README.md
index f231cf3..61af319 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,9 @@
 # go-hide-param
-Hide cmd line params in Golang.
+Cmd line params hiding tool for win & unix in Golang.
+
+## Usage
+```go
+import para "github.com/fumiama/go-hide-param"
+// This will hide os.Args[index]
+para.Hide(index)
+```