diff --git a/src/annotator/anchoring/pdf.ts b/src/annotator/anchoring/pdf.ts
index 1fdd70971dd..6696db7d30d 100644
--- a/src/annotator/anchoring/pdf.ts
+++ b/src/annotator/anchoring/pdf.ts
@@ -261,7 +261,7 @@ const isNotSpace = (char: string) => !isSpace(char);
 
 /**
  * Determines if provided text layer is done rendering.
- * It works on older PDF.js versions which expose a public renderingDone prop,
+ * It works on older PDF.js versions which expose a public `renderingDone` prop,
  * and newer versions as well
  */
 export function isTextLayerRenderingDone(textLayer: TextLayer): boolean {
diff --git a/src/annotator/anchoring/test/pdf-test.js b/src/annotator/anchoring/test/pdf-test.js
index 7199d6645e1..065e33bb12e 100644
--- a/src/annotator/anchoring/test/pdf-test.js
+++ b/src/annotator/anchoring/test/pdf-test.js
@@ -741,18 +741,22 @@ describe('annotator/anchoring/pdf', () => {
     });
 
     [
-      { element: null, expectedResult: false },
-      { element: {}, expectedResult: true },
-    ].forEach(({ element, expectedResult }) => {
+      { div: document.createElement('div'), expectedResult: false },
+      {
+        div: (function () {
+          const div = document.createElement('div');
+
+          const endOfContent = document.createElement('div');
+          endOfContent.className = 'endOfContent';
+          div.append(endOfContent);
+
+          return div;
+        })(),
+        expectedResult: true,
+      },
+    ].forEach(({ div, expectedResult }) => {
       it('returns true if the div contains an endOfContent element', () => {
-        assert.equal(
-          isTextLayerRenderingDone({
-            div: {
-              querySelector: () => element,
-            },
-          }),
-          expectedResult,
-        );
+        assert.equal(isTextLayerRenderingDone({ div }), expectedResult);
       });
     });
   });
diff --git a/src/types/pdfjs.ts b/src/types/pdfjs.ts
index 7d63e026bfb..c7373e039fa 100644
--- a/src/types/pdfjs.ts
+++ b/src/types/pdfjs.ts
@@ -171,6 +171,7 @@ export type PDFViewerApplication = {
    * Indicates the download of the PDF has completed.
    * This prop is not set in PDF.js >=4.5, in which case you should use
    * `PDFViewerApplication.pdfDocument.getDownloadInfo()` instead.
+   * See https://github.com/mozilla/pdf.js/pull/18463/commits/64a4f0dc7e60e86a7c1da1dc903497fff71abe2c
    *
    * @see {PDFDocument}
    */