diff --git a/xml/System.Net.Security/AuthenticatedStream.xml b/xml/System.Net.Security/AuthenticatedStream.xml
index 0ee6e89d080..6e0e9a0973e 100644
--- a/xml/System.Net.Security/AuthenticatedStream.xml
+++ b/xml/System.Net.Security/AuthenticatedStream.xml
@@ -182,9 +182,20 @@ The following example demonstrates displaying the properties of an authenticated
       </ReturnValue>
       <Parameters />
       <Docs>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <summary>Asynchronously releases the unmanaged and managed resources used by the <see cref="T:System.Net.Security.AuthenticatedStream" />.</summary>
+        <returns>A task that represents the asynchronous dispose operation.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+ This method allows performing resource-intensive dispose operations without blocking the main thread.
+
+ This method also disposes the inner stream when <xref:System.Net.Security.AuthenticatedStream.LeaveInnerStreamOpen> is `false`; otherwise, the inner stream is just flushed.
+ 
+ Calling `DisposeAsync` allows the resources used by the <xref:System.Net.Security.AuthenticatedStream> to be reallocated for other purposes. For more information, see [Cleaning Up Unmanaged Resources](~/docs/standard/garbage-collection/unmanaged.md).
+  
+ ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="InnerStream">
@@ -536,4 +547,4 @@ The following example demonstrates displaying the value of this property.
       </Docs>
     </Member>
   </Members>
-</Type>
\ No newline at end of file
+</Type>
diff --git a/xml/System.Net.Security/NegotiateStream.xml b/xml/System.Net.Security/NegotiateStream.xml
index ec8a9695da6..4d6218ff33b 100644
--- a/xml/System.Net.Security/NegotiateStream.xml
+++ b/xml/System.Net.Security/NegotiateStream.xml
@@ -2629,9 +2629,21 @@ The following method is called when the operation completes.
       </ReturnValue>
       <Parameters />
       <Docs>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <summary>Asynchronously releases the unmanaged and managed resources used by the <see cref="T:System.Net.Security.NegotiateStream" />.</summary>
+        <returns>A task that represents the asynchronous dispose operation.</returns>
+        <remarks>
+          <format type="text/markdown">
+  <![CDATA[  
+  
+## Remarks  
+ This method enables you to perform a resource-intensive dispose operation without blocking the main thread. 
+
+ This method also disposes the inner stream when <xref:System.Net.Security.AuthenticatedStream.LeaveInnerStreamOpen> is `false`; otherwise, the inner stream is just flushed.
+ 
+ Calling `DisposeAsync` allows the resources used by the <xref:System.Net.Security.NegotiateStream> to be reallocated for other purposes. For more information, see [Cleaning Up Unmanaged Resources](~/docs/standard/garbage-collection/unmanaged.md).
+  
+ ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="EndAuthenticateAsClient">
@@ -3822,4 +3834,4 @@ Authentication has not occurred.</exception>
       </Docs>
     </Member>
   </Members>
-</Type>
\ No newline at end of file
+</Type>
diff --git a/xml/System.Net.Security/SslStream.xml b/xml/System.Net.Security/SslStream.xml
index 91a5d1ac163..a79974a04cc 100644
--- a/xml/System.Net.Security/SslStream.xml
+++ b/xml/System.Net.Security/SslStream.xml
@@ -2451,9 +2451,21 @@
       </ReturnValue>
       <Parameters />
       <Docs>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <summary>Asynchronously releases the unmanaged and managed resources used by the <see cref="T:System.Net.Security.SslStream" />.</summary>
+        <returns>A task that represents the asynchronous dispose operation.</returns>
+        <remarks>
+          <format type="text/markdown">
+  <![CDATA[  
+  
+## Remarks  
+ This method enables you to perform a resource-intensive dispose operation without blocking the main thread. 
+
+ This method also disposes the inner stream when <xref:System.Net.Security.AuthenticatedStream.LeaveInnerStreamOpen> is `false`; otherwise, the inner stream is just flushed.
+ 
+ Calling `DisposeAsync` allows the resources used by the <xref:System.Net.Security.SslStream> to be reallocated for other purposes. For more information, see [Cleaning Up Unmanaged Resources](~/docs/standard/garbage-collection/unmanaged.md).
+  
+ ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="EndAuthenticateAsClient">
@@ -3597,11 +3609,26 @@ Authentication has not occurred.</exception>
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="1" FrameworkAlternate="netcore-3.0" />
       </Parameters>
       <Docs>
-        <param name="buffer">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="buffer">The buffer that receives the bytes read from this stream.</param>
+        <param name="cancellationToken">The token to monitor for cancellation requests.</param>
+        <summary>Asynchronously reads data from this stream and stores it in the specified memory range.</summary>
+        <returns>A task that represents the asynchronous read operation. The value of its <see cref="P:System.Threading.Tasks.ValueTask`1.Result" /> property contains the total number of bytes read into <paramref name="buffer" />. When there is no more data to be read, returns 0.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+ This method reads as much data as is available into the `buffer`. 
+ 
+ You cannot perform multiple simultaneous read operations.  
+  
+ You cannot call this method until you have successfully authenticated.
+
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.InvalidOperationException">Authentication has not occurred.</exception>
+        <exception cref="T:System.IO.IOException">The read operation failed. Check the inner exception, if it is present, to determine the cause of the failure.</exception>
+        <exception cref="T:System.NotSupportedException">There is already a read operation in progress.</exception>
+        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
       </Docs>
     </Member>
     <Member MemberName="ReadAsync">
@@ -3631,13 +3658,38 @@ Authentication has not occurred.</exception>
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="3" FrameworkAlternate="netcore-3.0" />
       </Parameters>
       <Docs>
-        <param name="buffer">To be added.</param>
-        <param name="offset">To be added.</param>
-        <param name="count">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="buffer">The buffer that receives the bytes read from this stream.</param>
+        <param name="offset">The zero-based location in <paramref name="buffer" /> at which to begin storing the data read from this stream.</param>
+        <param name="count">The maximum number of bytes to read from this stream.</param>
+        <param name="cancellationToken">The token to monitor for cancellation requests.</param>
+        <summary>Asynchronously reads data from this stream and stores it in the specified range of a byte array.</summary>
+        <returns>A task that represents the asynchronous read operation. The value of its <see cref="P:System.Threading.Tasks.Task`1.Result" /> property contains the total number of bytes read into <paramref name="buffer" />. When there is no more data to be read, returns 0.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+ The method reads a maximum of `count` bytes from the stream and stores them in `buffer` beginning at `offset`. 
+ 
+ You cannot perform multiple simultaneous read operations.  
+  
+ You cannot call this method until you have successfully authenticated.
+
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.ArgumentNullException"><paramref name="buffer" /> is <see langword="null" />.</exception>
+        <exception cref="T:System.ArgumentOutOfRangeException"><paramref name="offset" /> is less than 0.  
+  
+ -or-  
+  
+ <paramref name="count" /> is less than 0.
+  
+ -or-  
+  
+ <paramref name="count" /> is greater than the length of <paramref name="buffer" /> minus <paramref name="offset" />.</exception>
+        <exception cref="T:System.InvalidOperationException">Authentication has not occurred.</exception>
+        <exception cref="T:System.IO.IOException">The read operation failed. Check the inner exception, if it is present, to determine the cause of the failure.</exception>
+        <exception cref="T:System.NotSupportedException">There is already a read operation in progress.</exception>
+        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
       </Docs>
     </Member>
     <Member MemberName="ReadByte">
@@ -3663,9 +3715,22 @@ Authentication has not occurred.</exception>
       </ReturnValue>
       <Parameters />
       <Docs>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <summary>Reads a byte from the <see cref="T:System.Net.Security.SslStream" /> and advances the position within the stream by one byte, or returns -1 if at the end of the stream.</summary>
+        <returns>The unsigned byte cast to an <see langword="Int32"/>, or -1 if at the end of the stream.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks   
+ You cannot perform multiple simultaneous read operations.  
+  
+ You cannot call this method until you have successfully authenticated.
+
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.InvalidOperationException">Authentication has not occurred.</exception>
+        <exception cref="T:System.IO.IOException">The read operation failed. Check the inner exception, if present to determine the cause of the failure.</exception>
+        <exception cref="T:System.NotSupportedException">There is already a read operation in progress.</exception>
+        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
       </Docs>
     </Member>
     <Member MemberName="ReadTimeout">
@@ -4161,11 +4226,24 @@ Authentication has not occurred.</exception>
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="1" FrameworkAlternate="netcore-3.0" />
       </Parameters>
       <Docs>
-        <param name="buffer">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="buffer">The data to write to the underlying stream.</param>
+        <param name="cancellationToken">The token to monitor for cancellation requests.</param>
+        <summary>Asynchronously writes data to the underlying stream from a read-only byte memory range.</summary>
+        <returns>A task that represents the asynchronous write operation.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+You cannot call this method until you have successfully authenticated. 
+
+The <xref:System.Net.Security.SslStream> class does not support multiple simultaneous write operations.
+
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.InvalidOperationException">Authentication has not occurred.</exception>
+        <exception cref="T:System.IO.IOException">The write operation failed.</exception>
+        <exception cref="T:System.NotSupportedException">There is already a write operation in progress.</exception>
+        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
       </Docs>
     </Member>
     <Member MemberName="WriteAsync">
@@ -4195,13 +4273,36 @@ Authentication has not occurred.</exception>
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="3" FrameworkAlternate="netcore-3.0" />
       </Parameters>
       <Docs>
-        <param name="buffer">To be added.</param>
-        <param name="offset">To be added.</param>
-        <param name="count">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="buffer">The data to write to the underlying stream.</param>
+        <param name="offset">The location in <paramref name="buffer" /> from which to start writing data.</param>
+        <param name="count">The number of bytes to write to the underlying stream.</param>
+        <param name="cancellationToken">The token to monitor for cancellation requests.</param>
+        <summary>Asynchronously writes data to the underlying stream from the specified range of a byte array.</summary>
+        <returns>A task that represents the asynchronous write operation.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks  
+You cannot call this method until you have successfully authenticated. 
+
+The <xref:System.Net.Security.SslStream> class does not support multiple simultaneous write operations.
+
+ ]]></format>
+        </remarks>
+        <exception cref="T:System.ArgumentNullException"><paramref name="buffer" /> is <see langword="null" />.</exception>
+        <exception cref="T:System.ArgumentOutOfRangeException"><paramref name="offset" /> is less than 0.  
+  
+ -or-  
+  
+ <paramref name="count" /> is less than 0.
+  
+ -or-  
+  
+ <paramref name="count" /> is greater than the length of <paramref name="buffer" /> minus <paramref name="offset" />.</exception>
+        <exception cref="T:System.InvalidOperationException">Authentication has not occurred.</exception>
+        <exception cref="T:System.IO.IOException">The write operation failed.</exception>
+        <exception cref="T:System.NotSupportedException">There is already a write operation in progress.</exception>
+        <exception cref="T:System.ObjectDisposedException">This object has been closed.</exception>
       </Docs>
     </Member>
     <Member MemberName="WriteTimeout">
@@ -4260,4 +4361,4 @@ Authentication has not occurred.</exception>
       </Docs>
     </Member>
   </Members>
-</Type>
\ No newline at end of file
+</Type>