diff --git a/index.bs b/index.bs
index 1fc0f8f..69834eb 100644
--- a/index.bs
+++ b/index.bs
@@ -287,6 +287,8 @@ enum RTCEncodedVideoFrameType {
 
 dictionary RTCEncodedVideoFrameMetadata {
     long long frameId;
+    unsigned long rtpTimestamp;
+    DOMHighResTimeStamp captureTime;
     sequence<long long> dependencies;
     unsigned short width;
     unsigned short height;