--- a/dom/webidl/PeerConnectionImpl.webidl
+++ b/dom/webidl/PeerConnectionImpl.webidl
@@ -84,17 +84,21 @@ interface PeerConnectionImpl  {
   /* This provides the implementation with the certificate it uses to
    * authenticate itself.  The JS side must set this before calling
    * createOffer/createAnswer or retrieving the value of fingerprint.  This has
    * to be delayed because generating the certificate takes some time. */
   attribute RTCCertificate certificate;
   [Constant]
   readonly attribute DOMString fingerprint;
   readonly attribute DOMString localDescription;
+  readonly attribute DOMString currentLocalDescription;
+  readonly attribute DOMString pendingLocalDescription;
   readonly attribute DOMString remoteDescription;
+  readonly attribute DOMString currentRemoteDescription;
+  readonly attribute DOMString pendingRemoteDescription;
 
   readonly attribute PCImplIceConnectionState iceConnectionState;
   readonly attribute PCImplIceGatheringState iceGatheringState;
   readonly attribute PCImplSignalingState signalingState;
   attribute DOMString id;
 
   attribute DOMString peerIdentity;
   readonly attribute boolean privacyRequested;