diff --git a/snapshot/src/core/dedup.ts b/snapshot/src/core/dedup.ts
index 8c19983..fb6275c 100644
--- a/snapshot/src/core/dedup.ts
+++ b/snapshot/src/core/dedup.ts
@@ -2,6 +2,8 @@ import type { SignedEvent } from './types.ts'
 
 export function dedupByDtag(events: SignedEvent[]): SignedEvent[] {
   const byDtag = new Map<string, SignedEvent>()
+  // Bei gleicher created_at gewinnt das zuerst gesehene event (relay-delivery-
+  // reihenfolge ist nicht-deterministisch, equal-timestamp = aequivalent).
   for (const ev of events) {
     const d = ev.tags.find((t) => t[0] === 'd')?.[1]
     if (!d) continue