diff --git a/src/display/api.js b/src/display/api.js
index d5aff8bc9..94572164f 100644
--- a/src/display/api.js
+++ b/src/display/api.js
@@ -2336,6 +2336,7 @@ class PDFWorker {
 
   /**
    * @param {PDFWorkerParameters} params - The worker initialization parameters.
+   * @returns {PDFWorker}
    */
   static fromPort(params) {
     if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {