diff --git a/src/matrix/room/timeline/Timeline.js b/src/matrix/room/timeline/Timeline.js
index 9a533c1c..528acd6c 100644
--- a/src/matrix/room/timeline/Timeline.js
+++ b/src/matrix/room/timeline/Timeline.js
@@ -48,6 +48,7 @@ export class Timeline {
         this._allEntries = null;
         /** Stores event entries that we had to fetch from hs/storage for reply previews (because they were not in timeline) */ 
         this._contextEntriesNotInTimeline = new Map();
+        /** Only used to decrypt non-persisted context entries fetched from the homeserver */
         this._decryptEntries = null;
         this._hsApi = hsApi;
         this.initializePowerLevels(powerLevelsObservable);