diff --git a/src/extensions/replay/sessionrecording.ts b/src/extensions/replay/sessionrecording.ts
index 4fee89594..57d778c97 100644
--- a/src/extensions/replay/sessionrecording.ts
+++ b/src/extensions/replay/sessionrecording.ts
@@ -138,12 +138,14 @@ const newQueuedEvent = (rrwebMethod: () => void): QueuedRRWebEvent => ({
 
 const LOGGER_PREFIX = '[SessionRecording]'
 
+// taken from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Cyclic_object_value#circular_references
 function circularReferenceReplacer() {
     const ancestors: any[] = []
     return function (_key: string, value: any) {
         if (isObject(value)) {
             // `this` is the object that value is contained in,
             // i.e., its direct parent.
+            // @ts-expect-error - TS was unhappy with `this` on the next line but the code is copied in from MDN
             while (ancestors.length > 0 && ancestors.at(-1) !== this) {
                 ancestors.pop()
             }