diff --git a/docs/source/guide/frontend_reference.md b/docs/source/guide/frontend_reference.md
index 5ad0c9533910..41f707eaf409 100644
--- a/docs/source/guide/frontend_reference.md
+++ b/docs/source/guide/frontend_reference.md
@@ -210,7 +210,10 @@ This events group contains top-level events. Those events are not related to any
 
 ### `labelStudioLoad`
 
-Label Studio instance is loaded.
+Label Studio instance is loaded. 
+
+!!! warning
+    This event does not work in custom scripts.
 
 **Event handler arguments**
 
@@ -222,6 +225,9 @@ Label Studio instance is loaded.
 
 The internal storage is initialized.
 
+!!! warning
+    This event does not work in custom scripts.
+
 **Event handler arguments**
 
 | Argument      | Type     | Description              |