diff --git a/lib/cli.js b/lib/cli.js
index b938a26f..555a7857 100644
--- a/lib/cli.js
+++ b/lib/cli.js
@@ -360,7 +360,7 @@ program
     , 'LDAP search field (or $LDAP_SEARCH_FIELD)'
     , String
     , process.env.LDAP_SEARCH_FIELD)
-  .option('--ldap-username-field <scope>'
+  .option('--ldap-username-field <username>'
     , 'LDAP username field (or $LDAP_USERNAME_FIELD)'
     , String
     , process.env.LDAP_USERNAME_FIELD || 'cn')