diff --git a/src/models/thread.ts b/src/models/thread.ts
index f2420842dfc..05e847594af 100644
--- a/src/models/thread.ts
+++ b/src/models/thread.ts
@@ -254,6 +254,7 @@ export class Thread extends ReadReceipt<EmittedEvents, EventHandlerMap> {
         if (!eventId) {
             return;
         }
+        // If the event is already in this thread, bail out
         if (this.findEventById(eventId)) {
             return;
         }