diff --git a/webrtc.html b/webrtc.html
index 644530128..4a0f514d6 100644
--- a/webrtc.html
+++ b/webrtc.html
@@ -4586,9 +4586,10 @@ <h2>
                                     <var>connection</var>.{{RTCPeerConnection/[[PendingRemoteDescription]]}}
                                     is not <code>null</code>, and represents
                                     the ICE [= generation =] for which
-                                    <var>candidate</var> was processed, add
-                                    <var>candidate</var> to
-                                    <var>connection</var>.{{RTCPeerConnection/[[PendingRemoteDescription]]}}.sdp.
+                                    <var>candidate</var> was processed, set
+                                    <var>connection</var>.{{RTCPeerConnection/[[PendingRemoteDescription]]}}
+                                    to a [=clone a description | clone of itself=] with
+                                    {{RTCSessionDescriptionInit/sdp}} updated to include <var>candidate</var>.
                                   </p>
                                 </li>
                                 <li>
@@ -4597,9 +4598,10 @@ <h2>
                                     <var>connection</var>.{{RTCPeerConnection/[[CurrentRemoteDescription]]}}
                                     is not <code>null</code>, and represents
                                     the ICE [= generation =] for which
-                                    <var>candidate</var> was processed, add
-                                    <var>candidate</var> to
-                                    <var>connection</var>.{{RTCPeerConnection/[[CurrentRemoteDescription]]}}.sdp.
+                                    <var>candidate</var> was processed,  set
+                                    <var>connection</var>.{{RTCPeerConnection/[[CurrentRemoteDescription]]}}
+                                    to a [=clone a description | clone of itself=] with
+                                    {{RTCSessionDescriptionInit/sdp}} updated to include <var>candidate</var>.
                                   </p>
                                 </li>
                                 <li>
@@ -12225,18 +12227,20 @@ <h3>
             <p>
               If <var>connection</var>.{{RTCPeerConnection/[[PendingLocalDescription]]}} is
               not <code>null</code>, and represents the ICE [= generation =]
-              for which <var>candidate</var> was gathered, add
-              <var>candidate</var> to
-              <var>connection</var>.{{RTCPeerConnection/[[PendingLocalDescription]]}}.sdp.
+              for which <var>candidate</var> was gathered, set
+              <var>connection</var>.{{RTCPeerConnection/[[PendingLocalDescription]]}} to a
+              [=clone a description | clone of itself=] with {{RTCSessionDescriptionInit/sdp}}
+              updated to include <var>candidate</var>.
             </p>
           </li>
           <li>
             <p>
               If <var>connection</var>.{{RTCPeerConnection/[[CurrentLocalDescription]]}} is
               not <code>null</code>, and represents the ICE [= generation =]
-              for which <var>candidate</var> was gathered, add
-              <var>candidate</var> to
-              <var>connection</var>.{{RTCPeerConnection/[[CurrentLocalDescription]]}}.sdp.
+              for which <var>candidate</var> was gathered, set
+              <var>connection</var>.{{RTCPeerConnection/[[CurrentLocalDescription]]}} to a
+              [=clone a description | clone of itself=] with {{RTCSessionDescriptionInit/sdp}}
+              updated to include <var>candidate</var>.
             </p>
           </li>
           <li>
@@ -12274,6 +12278,12 @@ <h3>
           changing. The selected pair and {{RTCIceTransportState}} are related
           and are handled in the same task.
         </p>
+        <p>
+          To <dfn class="abstract-op" data-lt="clone a description">clone a description</dfn>
+          with members <var>type</var> and <var>sdp</var>, return a new {{RTCSessionDescription}}
+          object constructed with {{RTCSessionDescription/type}} set to <var>type</var>,
+          and {{RTCSessionDescription/sdp}} set to <var>sdp</var>.
+        </p>
         <p>
           When the [= ICE Agent =] indicates that an {{RTCIceTransport}} has
           changed either the selected candidate pair, the