diff --git a/files/en-us/web/api/performanceobserver/performanceobserver/index.md b/files/en-us/web/api/performanceobserver/performanceobserver/index.md
index 13fce5dcd37654c..d7c42972bef8565 100644
--- a/files/en-us/web/api/performanceobserver/performanceobserver/index.md
+++ b/files/en-us/web/api/performanceobserver/performanceobserver/index.md
@@ -34,7 +34,7 @@ new PerformanceObserver(callback)
 
           - : The number of [buffered](/en-US/docs/Web/API/PerformanceObserver/observe#buffered) entries which got dropped from the buffer due to the buffer being full.
 
-            Note that this is only provided the first time the observer calls the callback, because once the observer starts emitting observations, it can clear the buffer. After the first time, `droppedEntriesCount` will be `undefined`.
+          Note that this is only provided the first time the observer calls the callback, when the buffered entries are replayed. Once the observer starts observing future observations, it no longer needs to use the buffer. After the first time, `options` will be an empty object (`{}`).
 
 ### Return value