diff --git a/dash/dash.py b/dash/dash.py
index 0616d9d488..5db81d4f09 100644
--- a/dash/dash.py
+++ b/dash/dash.py
@@ -720,7 +720,8 @@ def _validate_layout(self):
             component_id = getattr(component, 'id', None)
             if component_id and component_id in component_ids:
                 raise exceptions.DuplicateIdError(
-                    'Duplicate component id found : `{}`'.format(component_id))
+                    'Duplicate component id found'
+                    ' in the initial layout: `{}`'.format(component_id))
             component_ids.add(component_id)
 
     def _setup_server(self):