diff --git a/formatgamebook.py b/formatgamebook.py
index 58caa0e..a0910ab 100755
--- a/formatgamebook.py
+++ b/formatgamebook.py
@@ -140,7 +140,7 @@ if __name__ == '__main__':
                     dest='import_default_map_file',
                     help='ignore default map file')
     ap.add_argument('-t', '--template', metavar='D', dest='templatedirs',
-                    action='append', help='Add custom template dir')
+                    action='append', help='add custom template dir')
     args = ap.parse_args()
     templatedirs = ['templates',
                     os.path.join(os.path.dirname(sys.argv[0]), 'templates')]
diff --git a/readme.org b/readme.org
index 80ec91a..2094689 100644
--- a/readme.org
+++ b/readme.org
@@ -3,6 +3,19 @@
 A tool to format [[http://www.gamebooks.org/][gamebooks]] into various formats useful for playing the
 gamebook on paper or a screen (or for debugging it).
 
+** Usage
+: formatgamebook.py [-h] [-M] [-t D] inputfile [inputfile ...] outputfile
+:
+: positional arguments:
+:   inputfile             input gamebook file (eg test.json)
+:   outputfile            output file (eg test.tex or test.rtf)
+:
+: optional arguments:
+:   -h, --help            show this help message and exit
+:   -M, --no-default-map  ignore default map file
+:   -t D, --template D    add custom template dir
+
+
 ** Supported Output Formats
 
 | Name             | Extension | Description                                                                                     |