diff --git a/README.md b/README.md
index b5a14c3..2befa6b 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ view the output with GNU Screen and run commands.
 
 ## Usage
 ```bash
-mca [OPTION]... [NAME|JAR|MDIR] [INPUT]...
+mca [OPTION]... [NAME|JAR|DIR] [INPUT]...
 ```
 
 ## MCA examples