diff --git a/packages/core/src/generators/metadata/maps/mdn.json b/packages/core/src/generators/metadata/maps/mdn.json
index 9d09d056..f27807cd 100644
--- a/packages/core/src/generators/metadata/maps/mdn.json
+++ b/packages/core/src/generators/metadata/maps/mdn.json
@@ -554,6 +554,7 @@
   "oes_vertex_array_object": "https://developer.mozilla.org/docs/Web/API/OES_vertex_array_object",
   "otpcredential": "https://developer.mozilla.org/docs/Web/API/OTPCredential",
   "ovr_multiview2": "https://developer.mozilla.org/docs/Web/API/OVR_multiview2",
+  "observable": "https://developer.mozilla.org/docs/Web/API/Observable",
   "offlineaudiocompletionevent": "https://developer.mozilla.org/docs/Web/API/OfflineAudioCompletionEvent",
   "offlineaudiocontext": "https://developer.mozilla.org/docs/Web/API/OfflineAudioContext",
   "offscreencanvas": "https://developer.mozilla.org/docs/Web/API/OffscreenCanvas",
@@ -827,6 +828,7 @@
   "stylesheet": "https://developer.mozilla.org/docs/Web/API/StyleSheet",
   "stylesheetlist": "https://developer.mozilla.org/docs/Web/API/StyleSheetList",
   "submitevent": "https://developer.mozilla.org/docs/Web/API/SubmitEvent",
+  "subscriber": "https://developer.mozilla.org/docs/Web/API/Subscriber",
   "subtlecrypto": "https://developer.mozilla.org/docs/Web/API/SubtleCrypto",
   "summarizer": "https://developer.mozilla.org/docs/Web/API/Summarizer",
   "syncevent": "https://developer.mozilla.org/docs/Web/API/SyncEvent",