Clarification on how to format the {index} part when listening via MQTT topic
@@ -516,7 +516,7 @@ IOTA node(s) provides [Message Queuing Telemetry Transport](https://en.wikipedia
* milestones/confirmed
* messages
* messages/referenced
-* messages/indexation/{index}
+* messages/indexation/{index} (index needs to be formatted as hex-string, i.e. string: HORNET Spammer ==> hex-string: 484f524e4554205370616d6d6572)
* messages/{messageId}/metadata
* transactions/{transactionId}/included-message
* outputs/{outputId}
