diff --git a/index.bs b/index.bs
index ad1f80a..a97ba15 100644
--- a/index.bs
+++ b/index.bs
@@ -422,11 +422,15 @@ dictionary RTCEncodedVideoFrameMetadata {
 
 ## <dfn interface>RTCEncodedVideoFrame</dfn> interface ## {#RTCEncodedVideoFrame-interface}
 <pre class="idl">
+dictionary RTCEncodedVideoFrameMetadataOptions {
+    RTCEncodedVideoFrameMetadata metadata;
+};
+
 // New interfaces to define encoded video and audio frames. Will eventually
 // re-use or extend the equivalent defined in WebCodecs.
 [Exposed=(Window,DedicatedWorker), Serializable]
 interface RTCEncodedVideoFrame {
-    constructor(RTCEncodedVideoFrame originalFrame, optional RTCEncodedVideoFrameMetadata newMetadata);
+    constructor(RTCEncodedVideoFrame originalFrame, optional RTCEncodedVideoFrameMetadataOptions options = {});
     readonly attribute RTCEncodedVideoFrameType type;
     attribute ArrayBuffer data;
     RTCEncodedVideoFrameMetadata getMetadata();
@@ -440,15 +444,15 @@ interface RTCEncodedVideoFrame {
     </dt>
     <dd>
         <p>
-            Creates a new {{RTCEncodedVideoFrame}} from the given |originalFrame| and sets the internal metadata to |newMetadata|.
+            Creates a new {{RTCEncodedVideoFrame}} from the given |originalFrame| and sets the internal `[[metadata]]` slot to |options|`[metadata]`.
             
             When called, run the following steps:
 
             1. Set this.`[[type]]` to |originalFrame|.`[[type]]`.
             1. Let this.`[[data]]` be a new ArrayBuffer object whose `[[ArrayBufferData]]` internal slot value is |originalFrame|.`[[data]]`.`[[ArrayBufferData]]`, and whose `[[ArrayBufferByteLength]]` internal slot value is |originalFrame|.`[[data]]`.`[[ArrayBufferByteLength]]`.
-            1. Let `[[metadata]]` represent the metadata associated with this newly constructed frame.
+            1. Let `[[metadata]]` be the internal slot that stores the metadata associated with this newly constructed frame.
                 1. For each {`[[key]]`,`[[value]]`} pair of |originalFrame|.`[[getMetadata()]]`, set `[[metadata]]`.`[[key]]` to `[[value]]`.
-                1. For each {`[[key]]`,`[[value]]`} pair of |newMetadata|, if the `[[value]]` exists, set `[[metadata]]`.`[[key]]` to `[[value]]`.
+                1. For each {`[[key]]`,`[[value]]`} pair of |options|`[metadata]`, if the `[[value]]` exists, set `[[metadata]]`.`[[key]]` to `[[value]]`.
 
         </p>
     </dd>
@@ -646,9 +650,13 @@ dictionary RTCEncodedAudioFrameMetadata {
 
 ## <dfn interface>RTCEncodedAudioFrame</dfn> interface ## {#RTCEncodedAudioFrame-interface}
 <pre class="idl">
+dictionary RTCEncodedAudioFrameMetadataOptions {
+    RTCEncodedAudioFrameMetadata metadata;
+};
+
 [Exposed=(Window,DedicatedWorker), Serializable]
 interface RTCEncodedAudioFrame {
-    constructor(RTCEncodedAudioFrame originalFrame, optional RTCEncodedAudioFrameMetadata newMetadata);
+    constructor(RTCEncodedAudioFrame originalFrame, optional RTCEncodedAudioFrameMetadataOptions options = {});
     attribute ArrayBuffer data;
     RTCEncodedAudioFrameMetadata getMetadata();
 };
@@ -661,14 +669,14 @@ interface RTCEncodedAudioFrame {
     </dt>
     <dd>
         <p>
-            Creates a new {{RTCEncodedAudioFrame}} from the given |originalFrame| and sets the internal metadata to |newMetadata|.
+            Creates a new {{RTCEncodedAudioFrame}} from the given |originalFrame| and sets the internal `[[metadata]]` slot to |options|`[metadata]`.
             
             When called, run the following steps:
 
             1. Let this.`[[data]]` be a new ArrayBuffer object whose `[[ArrayBufferData]]` internal slot value is |originalFrame|.`[[data]]`.`[[ArrayBufferData]]`, and whose `[[ArrayBufferByteLength]]` internal slot value is |originalFrame|.`[[data]]`.`[[ArrayBufferByteLength]]`.
-            1. Let `[[metadata]]` represent the metadata associated with this newly constructed frame.
+            1. Let `[[metadata]]` be the internal slot that stores the metadata associated with this newly constructed frame.
                 1. For each {`[[key]]`,`[[value]]`} pair of |originalFrame|.`[[getMetadata()]]`, set `[[metadata]]`.`[[key]]` to `[[value]]`.
-                1. For each {`[[key]]`,`[[value]]`} pair of |newMetadata|, if the `[[value]]` exists, set `[[metadata]]`.`[[key]]` to `[[value]]`.
+                1. For each {`[[key]]`,`[[value]]`} pair of |options|`[metadata]`, if the `[[value]]` exists, set `[[metadata]]`.`[[key]]` to `[[value]]`.
 
         </p>
     </dd>