diff --git a/api/DocumentFragment.json b/api/DocumentFragment.json
index 2cfa38104d91f6..e79f00efe4e6bc 100644
--- a/api/DocumentFragment.json
+++ b/api/DocumentFragment.json
@@ -224,6 +224,7 @@
       },
       "getElementById": {
         "__compat": {
+          "mdn_url": "https://developer.mozilla.org/docs/Web/API/DocumentFragment/getElementById",
           "spec_url": "https://dom.spec.whatwg.org/#dom-nonelementparentnode-getelementbyid",
           "support": {
             "chrome": {