Update README.rst

diff --git a/README.rst b/README.rst
index 342f69239faf484f4f77a5c5487f28e7bfcbdced..caa7ddf802e28fd0dfc00c16595f540e9bc8ea0f 100644 (file)
--- a/README.rst
+++ b/README.rst
@@ -52,7 +52,7 @@ Running ``xkcdpass``
 
 which returns a single password, using the default dictionary and default settings. Or you can mix whatever arguments you want::
 
-    $ xkcdpass --count=5 --acrostic='chaos' --delimiter='|' --min=5 --max=6 --valid_chars='[a-z]'
+    $ xkcdpass --count=5 --acrostic='chaos' --delimiter='|' --min=5 --max=6 --valid-chars='[a-z]'
     > collar|highly|asset|ovoid|sultan
     > caper|hangup|addle|oboist|scroll
     > couple|honcho|abbot|obtain|simple