diff --git a/README.md b/README.md
index 4169d38..66ea715 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,10 @@
 # openvpn-user
 
-### disclaimer
-Not tested in production environments!
+## Disclaimer
+```diff
+- Not tested in production environments! 
+```
+
 
 Use it on your own risk =)
 
@@ -9,14 +12,16 @@ Use it on your own risk =)
 A simple tool to use with openvpn when you need to use `–auth-user-pass-verify` or wherever you want
 
 ### Example
+make sure `openvpn-user` binary available through `PATH` variable and you have `auth.sh` script with `+x` rights available to openvpn server
+
+i.e. put binary to `/usr/local/sbin/` and auth script to `/etc/openvpn/scripts/` dir
 
 part of openvpn server config
 ```bash
+script-security 2
 auth-user-pass-verify /etc/openvpn/scripts/auth.sh via-file
 ```
 
-make sure `openvpn-user` binary available through `PATH` variable 
-i.e. put it in `/usr/local/sbin/openvpn-user`
 
 ### Usage
 ```
diff --git a/openvpn-user.go b/openvpn-user.go
index 49c3d93..1bd759a 100644
--- a/openvpn-user.go
+++ b/openvpn-user.go
@@ -32,6 +32,9 @@ var (
 	listCommand = kingpin.Command("list", "List active users.")
 	listAll     = listCommand.Flag("all", "Show all users include revoked and deleted.").Default("false").Bool()
 
+	checkCommand             = kingpin.Command("check", "check user existent.")
+	checkCommandUserFlag     = checkCommand.Flag("user", "Username.").Required().String()
+
 	authCommand             = kingpin.Command("auth", "Auth user.")
 	authCommandUserFlag     = authCommand.Flag("user", "Username.").Required().String()
 	authCommandPasswordFlag = authCommand.Flag("password", "Password.").Required().String()
@@ -66,6 +69,8 @@ func main() {
 		restoreUser(*restoreCommandUserFlag)
 	case listCommand.FullCommand():
 		printUsers()
+	case checkCommand.FullCommand():
+		_ = checkUserExistent(*checkCommandUserFlag)
 	case authCommand.FullCommand():
 		authUser(*authCommandUserFlag, *authCommandPasswordFlag)
 	case changePasswordCommand.FullCommand():
@@ -128,7 +133,7 @@ func restoreUser(username string) {
 
 func checkUserExistent(username string) bool {
 	// we need to check if there is already such a user
-
+ 	// return true if user exist
 	var c int
 	_ = getDb().QueryRow("SELECT count(*) FROM users WHERE username = $1", username).Scan(&c)
 	if c == 1  {