Fixed typo
diff --git a/letsencrypt/cli.py b/letsencrypt/cli.py
index 0797f23b4eb..6692d9c9902 100644
--- a/letsencrypt/cli.py
+++ b/letsencrypt/cli.py
@@ -57,7 +57,7 @@
   install              Install a previously obtained cert in a server
   revoke               Revoke a previously obtained certificate
   rollback             Rollback server configuration changes made during install
-  config-changes       Show changes made to server config during installation
+  config_changes       Show changes made to server config during installation
 
 Choice of server for authentication/installation:
 

Changed config-changes in the short help (wrong) to config_changes (right)
