diff --git a/api/InputDeviceCapabilities.json b/api/InputDeviceCapabilities.json
index 54c45e75b7155b..132feb65229869 100644
--- a/api/InputDeviceCapabilities.json
+++ b/api/InputDeviceCapabilities.json
@@ -51,6 +51,7 @@
       "InputDeviceCapabilities": {
         "__compat": {
           "mdn_url": "https://developer.mozilla.org/docs/Web/API/InputDeviceCapabilities/InputDeviceCapabilities",
+          "spec_url": "https://wicg.github.io/input-device-capabilities/#dom-inputdevicecapabilities-constructor",
           "description": "<code>InputDeviceCapabilities()</code> constructor",
           "support": {
             "chrome": {