diff --git a/README.md b/README.md
index 98e859b..6e72836 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,17 @@
 
 checkpw is a program that checks the validity of a users password on a Linux/PAM-based system.
 
+```
+Usage: ./checkpw [-u <username>] [-p <password>] [-i] [-v] [-h]
+
+Options:
+  -u <username>  Specify username.
+  -p <password>  Specify password.
+  -i             Enable interactive mode to prompt for missing username/password.
+  -v             Enable verbose mode.
+  -h             Show this help
+```
+
 Returns 0 on success, 1 otherwise.
 
 # Installation: