diff --git a/specs.json b/specs.json
index d7002228..01ca5286 100644
--- a/specs.json
+++ b/specs.json
@@ -452,6 +452,7 @@
       "ecma-402"
     ]
   },
+  "https://tc39.es/proposal-is-error/",
   {
     "url": "https://tc39.es/proposal-is-usv-string/",
     "standing": "discontinued",