diff --git a/README.md b/README.md
index b2e72f8..831b283 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ Usage
 -----
 alphadoc takes your filename and format type as arguments
 
-    $ alphadoc <filename> --d <doc_format>
+    $ alphadoc <filename> -d <doc_format>
 
 See `alphadoc --help` for more command-line switches and options!