Add note on removing handler

Author: bobbyatsegment

src/connections/functions/insert-functions.md

@@ -60,6 +60,9 @@ Segment invokes a separate part of the function (called a "handler") for each ev
 
 The default source code template includes handlers for all event types. You don't need to implement all of them - just use the ones you need, and skip the ones you don't.
 
+> info ""
+> Removing the handler for a specific event type will result in the events of that type being blocked from arriving at their destination.
+
 Insert functions can define handlers for each message type in the [Segment spec](/docs/connections/spec/):
 
 - `onIdentify`
@@ -354,4 +357,4 @@ DELETE deleteInsertFunction(fn_id)
 
 For more information, visit Segment's [Public API docs](https://docs.segmentapis.com/tag/Functions){:target="_blank"}.
 
-{% endcomment %}
+{% endcomment %}