diff --git a/README.md b/README.md
index 5de11ad8..bc809590 100644
--- a/README.md
+++ b/README.md
@@ -210,3 +210,5 @@ Look for gtm_auth and gtm_preview
 ### Note:
 
 - Disabling javascript in the browser can prevent the correct operation of this library if React is only being rendered on the client side.
+
+- Before implementing GTM in your application ensure that you have at least one published container, otherwise Google Tag Manager snippet will return 404.
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