diff --git a/xml/System.Buffers/ReadOnlySequence`1.xml b/xml/System.Buffers/ReadOnlySequence`1.xml
index a5b3d6657a9..10fb99bd565 100644
--- a/xml/System.Buffers/ReadOnlySequence`1.xml
+++ b/xml/System.Buffers/ReadOnlySequence`1.xml
@@ -351,10 +351,11 @@ The consumer is expected to manage the lifetime of memory until <see cref="T:Sys
         <Parameter Name="position" Type="System.SequencePosition" Index="0" FrameworkAlternate="net-5.0" />
       </Parameters>
       <Docs>
-        <param name="position">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="position">The <see cref="T:System.SequencePosition" /> of which to get the offset.</param>
+        <summary>Returns the offset of a <paramref name="position" /> within this sequence from the start.</summary>
+        <returns>The offset from the start of the sequence.</returns>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.ArgumentOutOfRangeException">The position is out of range.</exception>
       </Docs>
     </Member>
     <Member MemberName="GetPosition">
diff --git a/xml/System.Buffers/SequenceReader`1.xml b/xml/System.Buffers/SequenceReader`1.xml
index 934c5b685c5..488cda0b7a6 100644
--- a/xml/System.Buffers/SequenceReader`1.xml
+++ b/xml/System.Buffers/SequenceReader`1.xml
@@ -972,7 +972,7 @@ This method copies a fixed amount of data out of the sequence if possible. It do
         <param name="delimiter">The delimiter to look for.</param>
         <param name="advancePastDelimiter">
           <see langword="true" /> to move past the <paramref name="delimiter" /> if found.</param>
-        <param name="span">To be added.</param>
+        <param name="span">The read data, if any.</param>
         <summary>Try to read everything up to the given <paramref name="delimiter" />.</summary>
         <returns>
           <see langword="true" /> if the <paramref name="delimiter" /> was found; otherwise, <see langword="false" />.</returns>