diff --git a/scanning.bs b/scanning.bs
index e39b5fb..8011f64 100644
--- a/scanning.bs
+++ b/scanning.bs
@@ -203,7 +203,7 @@ spec: permissions-1
 
     partial interface Bluetooth {
       [SecureContext]
-      Promise<BluetoothLEScan> requestLEScan(optional BluetoothLEScanOptions options);
+      Promise<BluetoothLEScan> requestLEScan(optional BluetoothLEScanOptions options = {});
     };
   </pre>
   <div class="note" heading="{{Bluetooth/requestLEScan()}} summary">
@@ -351,7 +351,7 @@ spec: permissions-1
     <pre class="idl">
       [Exposed=Window, SecureContext]
       interface BluetoothDataFilter {
-        constructor(optional BluetoothDataFilterInit init);
+        constructor(optional BluetoothDataFilterInit init = {});
         readonly attribute ArrayBuffer dataPrefix;
         readonly attribute ArrayBuffer mask;
       };
@@ -370,7 +370,7 @@ spec: permissions-1
 
       [Exposed=Window, SecureContext]
       interface BluetoothLEScanFilter {
-        constructor(optional BluetoothLEScanFilterInit init);
+        constructor(optional BluetoothLEScanFilterInit init = {});
         readonly attribute DOMString? name;
         readonly attribute DOMString? namePrefix;
         readonly attribute FrozenArray&lt;UUID> services;