diff --git a/index.bs b/index.bs
index ae91c03..51e85fa 100644
--- a/index.bs
+++ b/index.bs
@@ -113,6 +113,10 @@ The terms {{ReadableStream}} and {{WritableStream}} are defined in [[WHATWG-STRE
 
 <h3 id="attributes">Attributes</h3>
 
+<h4 id="info-attribute">info</h4>
+
+The {{info}} attribute is a {{SocketInfo}} which contains information about the state of the socket.
+
 <h4 id="readable-attribute">readable</h4>
 
 The {{readable}} attribute is a {{ReadableStream}} which receives data from the server the socket is connected to.
@@ -322,6 +326,18 @@ At any point during the creation of the {{Socket}} instance, `connect` may throw
       <dd>Initially the same as the `off` option, the connection continues in plain text until the {{startTls()}} method is called</dd>
     </dl>
   </dd>
+  <dt>
+    {{alpn}} member
+  </dt>
+  <dd>
+    The Application-Layer Protocol Negotiation list to send, as an array of strings. If the server agrees with one of the protocols specified in this list, it will return the matching protocol in the {{info}} property. May be specified if and only if {{secureTransport}} is `on` or `starttls`.
+  </dd>
+  <dt>
+    {{sni}} member
+  </dt>
+  <dd>
+    The Server Name Indication TLS option to send as part of the TLS handshake. If specified, requests that the server send a certificate with a matching common name. May be specified if and only if {{secureTransport}} is `on` or `starttls`.
+  </dd>
   <dt>
     {{allowHalfOpen}} member
   </dt>
@@ -353,6 +369,12 @@ At any point during the creation of the {{Socket}} instance, `connect` may throw
   <dd>
     Optionally provides the hostname/port combo of the local network endpoint, for example `"localhost:12345"`.
   </dd>
+  <dt>
+    {{alpn}} property
+  </dt>
+  <dd>
+    If the server agrees with one of the protocols specified in the `alpn` negotiation list, returns that protocol name as a string, otherwise `null`. 
+  </dd>
 </d1>
 
 <h3 id="anysocketaddress-type">`AnySocketAddress` type</h3>