diff --git a/xml/System.IO/StringReader.xml b/xml/System.IO/StringReader.xml
index 9f03769bde9..569944bf196 100644
--- a/xml/System.IO/StringReader.xml
+++ b/xml/System.IO/StringReader.xml
@@ -461,10 +461,11 @@ This implementation of `Close` calls the <xref:System.IO.StringReader.Dispose%2A
         <Parameter Name="buffer" Type="System.Span&lt;System.Char&gt;" Index="0" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </Parameters>
       <Docs>
-        <param name="buffer">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="buffer">When this method returns, contains the characters read from the current source. If the total number of characters read is zero, the span remains unmodified.</param>
+        <summary>Reads all the characters from the input string, starting at the current position, and advances the current position to the end of the input string.</summary>
+        <returns>The total number of characters read into the buffer.</returns>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.ObjectDisposedException">The current string reader instance is closed.</exception>
       </Docs>
     </Member>
     <Member MemberName="Read">
@@ -577,10 +578,10 @@ This implementation of `Close` calls the <xref:System.IO.StringReader.Dispose%2A
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="1" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </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>
+        <param name="buffer">When this method returns, contains the characters read from the current source.</param>
+        <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="P:System.Threading.CancellationToken.None" />.</param>
+        <summary>Asynchronously reads all the characters from the input string, starting at the current position, and advances the current position to the end of the input string.</summary>
+        <returns>A task that represents the asynchronous read operation. The value of the <paramref name="TResult" /> parameter contains the total number of characters read into the buffer.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
@@ -686,10 +687,19 @@ This implementation of `Close` calls the <xref:System.IO.StringReader.Dispose%2A
         <Parameter Name="buffer" Type="System.Span&lt;System.Char&gt;" Index="0" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </Parameters>
       <Docs>
-        <param name="buffer">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="buffer">When this method returns, contains the characters read from the current source. If the total number of characters read is zero, the span remains unmodified.</param>
+        <summary>Reads all the characters from the input string starting at the current position and advances the current position to the end of the input string.</summary>
+        <returns>The total number of characters read into the buffer.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[
+
+## Remarks
+
+<xref:System.IO.StringReader.ReadBlock(System.Span{System.Char})> internally calls <xref:System.IO.StringReader.Read(System.Span{System.Char})> directly.
+
+          ]]></format>
+        </remarks>
+        <exception cref="T:System.ObjectDisposedException">The current string reader instance is closed.</exception>
       </Docs>
     </Member>
     <Member MemberName="ReadBlockAsync">
@@ -720,11 +730,20 @@ This implementation of `Close` calls the <xref:System.IO.StringReader.Dispose%2A
         <Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="1" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netstandard-2.1" />
       </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">When this method returns, contains the characters read from the current source. If the total number of characters read is zero, the span remains unmodified.</param>
+        <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="P:System.Threading.CancellationToken.None" />.</param>
+        <summary>Asynchronously reads all the characters from the input string starting at the current position and advances the current position to the end of the input string.</summary>
+        <returns>A task representing the asynchronous read operation. The value of the <paramref name="TResult" /> parameter contains the total number of characters read into the buffer.</returns>
+        <remarks>
+          <format type="text/markdown">
+  <![CDATA[
+
+## Remarks
+
+<xref:System.IO.StringReader.ReadBlockAsync(System.Memory{System.Char},System.Threading.CancellationToken)> calls <xref:System.IO.StringReader.ReadBlock(System.Span{System.Char})> asynchronously, which in turn calls <xref:System.IO.StringReader.Read(System.Span{System.Char})> directly.
+
+          ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="ReadBlockAsync">