diff --git a/index.js b/index.js
index fd7e6c461..46bb784cb 100644
--- a/index.js
+++ b/index.js
@@ -79,7 +79,7 @@ class ServerlessPlugin {
                         type: 'string',
                     },
                     function: {
-                        usage: 'The name of the function to invoke',
+                        usage: 'The name of the function to invoke (optional, auto-discovered by default)',
                         shortcut: 'f',
                         required: false,
                         type: 'string',