diff --git a/src/Unread.ts b/src/Unread.ts
index 905798eb03..91e192b371 100644
--- a/src/Unread.ts
+++ b/src/Unread.ts
@@ -23,7 +23,7 @@ import shouldHideEvent from './shouldHideEvent';
 import { haveTileForEvent } from "./components/views/rooms/EventTile";
 
 /**
- * Returns true iff this event arriving in a room should affect the room's
+ * Returns true if this event arriving in a room should affect the room's
  * count of unread messages
  *
  * @param {Object} ev The event