diff --git a/README.md b/README.md
index bec5a8f..79bb14e 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,7 @@
 # ck3json
-Convert CK3 save files to JSON
+Convert CK3 text format files to JSON
+
+## Usage
+`    ck3json <file> [grammar]`
+
+For more information try `--help`