diff --git a/packages/ses/README.md b/packages/ses/README.md
index 9bbb736142..59b27bc2d2 100644
--- a/packages/ses/README.md
+++ b/packages/ses/README.md
@@ -168,6 +168,8 @@ function on `globalThis`.
 ```js
 import 'ses';
 
+lockdown();
+
 const c = new Compartment({
   globals: {
     print: harden(console.log),