diff --git a/api/CSPViolationReportBody.json b/api/CSPViolationReportBody.json
index 0e7262b130d6d6..4e2171a349691c 100644
--- a/api/CSPViolationReportBody.json
+++ b/api/CSPViolationReportBody.json
@@ -489,6 +489,7 @@
       },
       "toJSON": {
         "__compat": {
+          "spec_url": "https://w3c.github.io/webappsec-csp/#dom-cspviolationreportbody-tojson",
           "support": {
             "chrome": {
               "version_added": "80"