Update insert-functions.md

Author: volneyvj

src/connections/functions/insert-functions.md

@@ -57,7 +57,8 @@ 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 results in blocking the events of that type from arriving at their destination. 
+> Removing the handler for a specific event type results in blocking the events of that type from arriving at their destination. In case an event type should remain as it is,
+> but you'd still need to parte it dowstream, you may merely add  a 'return event', inside the event type handler statement.
 
 Insert functions can define handlers for each message type in the [Segment spec](/docs/connections/spec/):