diff --git a/vector/src/main/java/im/vector/app/features/notifications/CircularCache.kt b/vector/src/main/java/im/vector/app/features/notifications/CircularCache.kt
index 9a979a2ec8..de91766fc3 100644
--- a/vector/src/main/java/im/vector/app/features/notifications/CircularCache.kt
+++ b/vector/src/main/java/im/vector/app/features/notifications/CircularCache.kt
@@ -17,7 +17,8 @@
 package im.vector.app.features.notifications
 
 /**
- * A FIFO circular buffer of strings
+ * A FIFO circular buffer of T
+ * This class is not thread safe
  */
 class CircularCache<T>(cacheSize: Int) {