diff --git a/api/Element.json b/api/Element.json
index c2afd17413d74c..184974f9ea09cc 100644
--- a/api/Element.json
+++ b/api/Element.json
@@ -3452,6 +3452,7 @@
       },
       "elementTiming": {
         "__compat": {
+          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Element/elementTiming",
           "spec_url": "https://wicg.github.io/element-timing/#dom-element-elementtiming",
           "support": {
             "chrome": {