diff --git a/support/doc/plugins/guide.md b/support/doc/plugins/guide.md
index 05cdb6edf1..6279dca1f1 100644
--- a/support/doc/plugins/guide.md
+++ b/support/doc/plugins/guide.md
@@ -193,6 +193,7 @@ function register ({
 }) {
   const value = await storageManager.getData('mykey')
   await storageManager.storeData('mykey', { subkey: 'value' })
+  await storageManager.deleteData('mykey')
 }
 ```