diff --git a/xml/System.Net.Http/WinHttpHandler.xml b/xml/System.Net.Http/WinHttpHandler.xml
index c6696bf5bdd..f7535d25ef1 100644
--- a/xml/System.Net.Http/WinHttpHandler.xml
+++ b/xml/System.Net.Http/WinHttpHandler.xml
@@ -416,8 +416,9 @@ When this property is set to `true`, all HTTP redirect responses from the server
         <ReturnType>System.Boolean</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets or sets a value that indicates whether additional HTTP/2 connections can be established to the same server when the maximum number of concurrent streams is reached on all existing connections.</summary>
+        <value>
+          <see langword="true" /> if additional HTTP/2 connections are allowed to be created; otherwise, <see langword="false" />.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
diff --git a/xml/System.Net.Security/ServerOptionsSelectionCallback.xml b/xml/System.Net.Security/ServerOptionsSelectionCallback.xml
index 01777d0026d..2bd10be3fd3 100644
--- a/xml/System.Net.Security/ServerOptionsSelectionCallback.xml
+++ b/xml/System.Net.Security/ServerOptionsSelectionCallback.xml
@@ -22,12 +22,18 @@
     <ReturnType>System.Threading.Tasks.ValueTask&lt;System.Net.Security.SslServerAuthenticationOptions&gt;</ReturnType>
   </ReturnValue>
   <Docs>
-    <param name="stream">To be added.</param>
-    <param name="clientHelloInfo">To be added.</param>
-    <param name="state">To be added.</param>
-    <param name="cancellationToken">To be added.</param>
-    <summary>To be added.</summary>
-    <returns>To be added.</returns>
-    <remarks>To be added.</remarks>
+    <param name="stream">The TLS stream on which the authentication happens.</param>
+    <param name="clientHelloInfo">Information from the Client Hello message.</param>
+    <param name="state">The information that was passed when registering the callback.</param>
+    <param name="cancellationToken">The token to monitor for cancellation requests.</param>
+    <summary>The asynchronous callback to select session properties based on name requested by client.</summary>
+    <returns>A server authentication property bag.</returns>
+    <remarks>
+      <format type="text/markdown"><![CDATA[
+
+This delegate provides authentication properties during the server authenticaton as an asynchronous operation.
+
+ ]]></format>
+    </remarks>
   </Docs>
 </Type>
diff --git a/xml/System.Net.Security/SslClientHelloInfo.xml b/xml/System.Net.Security/SslClientHelloInfo.xml
index 93b422c17e3..3b74b46e602 100644
--- a/xml/System.Net.Security/SslClientHelloInfo.xml
+++ b/xml/System.Net.Security/SslClientHelloInfo.xml
@@ -40,7 +40,7 @@
         <ReturnType>System.String</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>The host server specified by the client.</summary>
         <value>To be added.</value>
         <remarks>To be added.</remarks>
       </Docs>
@@ -61,8 +61,8 @@
         <ReturnType>System.Security.Authentication.SslProtocols</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets or sets the TLS/SSL protocols offered by client.</summary>
+        <value>A bitwise combination of the enumeration values that specify the TLS or SSL protocols.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
diff --git a/xml/System.Net.Security/SslServerAuthenticationOptions.xml b/xml/System.Net.Security/SslServerAuthenticationOptions.xml
index c10b577d983..13a95a62c67 100644
--- a/xml/System.Net.Security/SslServerAuthenticationOptions.xml
+++ b/xml/System.Net.Security/SslServerAuthenticationOptions.xml
@@ -332,8 +332,8 @@
         <ReturnType>System.Net.Security.SslStreamCertificateContext</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets or sets the server certificate context.</summary>
+        <value>The server certificate context.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
diff --git a/xml/System.Net.Security/SslStream.xml b/xml/System.Net.Security/SslStream.xml
index 38bab49fabc..7a876b7e023 100644
--- a/xml/System.Net.Security/SslStream.xml
+++ b/xml/System.Net.Security/SslStream.xml
@@ -1399,7 +1399,7 @@
  ]]></format>
         </remarks>
         <exception cref="T:System.ArgumentNullException">
-          Either <see cref="P:System.Net.Security.SslServerAuthenticationOptions.ServerCertificateSelectionCallback" /> or <see cref="P:System.Net.Security.SslServerAuthenticationOptions.ServerCertificate" /> is <see langword="null" /> and <see cref="T:System.Net.Security.LocalCertificateSelectionCallback" /> is not set in the <see langword="SslStream" /> constructor.</exception>
+          Either <see cref="P:System.Net.Security.SslServerAuthenticationOptions.ServerCertificateSelectionCallback" /> or <see cref="P:System.Net.Security.SslServerAuthenticationOptions.ServerCertificate" /> or <see cref="P:System.Net.Security.SslServerAuthenticationOptions.ServerCertificateContext" /> is <see langword="null" /> and <see cref="T:System.Net.Security.LocalCertificateSelectionCallback" /> is not set in the <see langword="SslStream" /> constructor.</exception>
         <exception cref="T:System.ArgumentNullException">
           <paramref name="sslServerAuthenticationOptions" /> is <see langword="null" />.</exception>
         <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed and left this object in an unusable state.</exception>
@@ -1438,12 +1438,33 @@
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="2" FrameworkAlternate="net-5.0" />
       </Parameters>
       <Docs>
-        <param name="optionsCallback">To be added.</param>
-        <param name="state">To be added.</param>
-        <param name="cancellationToken">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="optionsCallback">The callback delegate.</param>
+        <param name="state">The state object to pass to <paramref name="optionsCallback" /> when the callback is invoked.</param>
+        <param name="cancellationToken">The token to monitor for cancellation requests.</param>
+        <summary>Called by servers to authenticate the server and optionally the client in a client-server connection as an asynchronous operation. The authentication process uses information returned by <paramref name="optionsCallback" />.</summary>
+        <returns>The task object representing the asynchronous operation.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+ 
+ If the authentication fails, you receive a <xref:System.Security.Authentication.AuthenticationException>, and this <xref:System.Net.Security.SslStream> is no longer useable. You should close this object and remove all references to it so that it can be collected by the garbage collector.  
+  
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.ArgumentNullException">
+          Either <see cref="P:System.Net.Security.SslServerAuthenticationOptions.ServerCertificateSelectionCallback" /> or <see cref="P:System.Net.Security.SslServerAuthenticationOptions.ServerCertificate" /> or <see cref="P:System.Net.Security.SslServerAuthenticationOptions.ServerCertificateContext" /> is <see langword="null" /> and <see cref="T:System.Net.Security.LocalCertificateSelectionCallback" /> is not set in the <see langword="SslStream" /> constructor.</exception>
+        <exception cref="T:System.Security.Authentication.AuthenticationException">The authentication failed and left this object in an unusable state.</exception>
+        <exception cref="T:System.InvalidOperationException">Authentication has already occurred.  
+  
+ -or-  
+  
+ Client authentication using this <see cref="T:System.Net.Security.SslStream" /> was tried previously.  
+  
+ -or-  
+  
+ Authentication is already in progress.</exception>
+        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
       </Docs>
     </Member>
     <Member MemberName="AuthenticateAsServerAsync">
@@ -4346,8 +4367,8 @@ This property gets the cipher suite that is going to be used in the communicatio
         <ReturnType>System.String</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>Gets the name of the server the client is trying to connect to. That name is used for server certificate validation. It can be a DNS name or an IP address.</summary>
+        <value>The name of the server the client is trying to connect to.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
diff --git a/xml/System.Net.Security/SslStreamCertificateContext.xml b/xml/System.Net.Security/SslStreamCertificateContext.xml
index 214959e62e9..26e224c1085 100644
--- a/xml/System.Net.Security/SslStreamCertificateContext.xml
+++ b/xml/System.Net.Security/SslStreamCertificateContext.xml
@@ -14,7 +14,7 @@
   </Base>
   <Interfaces />
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Represents a set of certificates used for building a certificate chain.</summary>
     <remarks>To be added.</remarks>
   </Docs>
   <Members>
@@ -38,12 +38,15 @@
         <Parameter Name="offline" Type="System.Boolean" />
       </Parameters>
       <Docs>
-        <param name="target">To be added.</param>
-        <param name="additionalCertificates">To be added.</param>
-        <param name="offline">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="target">The server certificate.</param>
+        <param name="additionalCertificates">The certificates to chain.</param>
+        <param name="offline">
+          <see langword="true" /> to indicate that the missing certificates can be downloaded; otherwise, <see langword="false" />.</param>
+        <summary>Attempts to build the certificate chain from the provided certificates.</summary>
+        <returns>The certificate context with the newly created certificate chain.</returns>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.NotSupportedException">
+          <paramref name="target" /> doesn't have an associated private key.</exception>
       </Docs>
     </Member>
   </Members>