diff --git a/server/events.md b/server/events.md
index d9f0acb..7ff3cbf 100644
--- a/server/events.md
+++ b/server/events.md
@@ -3,6 +3,7 @@
 | -------- | ---- | -----------
 | status   | Integer | The response code of the server. This follows HTTP standards as described by [Mozilla's Documentation](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status)
 | message? | String | More information relating to the response. This is set iff `success` is a non 2XX value.
+| source?  | String | The event name that caused this response to be sent. This is set iff is a non 2XX value.
 
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