diff --git a/src/loopback.ts b/src/loopback.ts
index b9715012..d7b8069a 100644
--- a/src/loopback.ts
+++ b/src/loopback.ts
@@ -3,13 +3,26 @@ import { relayInit } from '@/deps.ts';
 import { trends } from '@/trends.ts';
 import { nostrNow } from '@/utils.ts';
 
+import type { Event } from '@/event.ts';
+
 const relay = relayInit(Conf.relay);
 await relay.connect();
 
-const sub = relay.sub([{ kinds: [1], since: nostrNow() }]);
+// This file watches all events on your Ditto relay and triggers
+// side-effects based on them. This can be used for things like
+// notifications, trending hashtag tracking, etc.
+relay
+  .sub([{ kinds: [1], since: nostrNow() }])
+  .on('event', handleEvent);
 
-sub.on('event', (event) => {
+/** Handle events through the loopback pipeline. */
+function handleEvent(event: Event): void {
   console.info('loopback event:', event.id);
+  trackHashtags(event);
+}
+
+/** Track whenever a hashtag is used, for processing trending tags. */
+function trackHashtags(event: Event): void {
   const tags = event.tags
     .filter((tag) => tag[0] === 't')
     .map((tag) => tag[1]);
@@ -19,4 +32,4 @@ sub.on('event', (event) => {
   } catch (_e) {
     // do nothing
   }
-});
+}