diff --git a/README.md b/README.md
index 9ec204a..2c93302 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,11 @@ Go the the URL below in google chrome.
 chrome://extensions/
 ```
 
+Make sure _Developer Mode_ is toggled on:
+
+![](./docs/assets/developer-mode-off.png)
+![](./docs/assets/developer-mode-on.png)
+
 Click the button `Load unpacked extension` and select the build folder.
 
 ## Develop
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