diff --git a/src/System.Memory/ref/System.Memory.cs b/src/System.Memory/ref/System.Memory.cs
index 0a55e89d5a43..bc50cb30c873 100644
--- a/src/System.Memory/ref/System.Memory.cs
+++ b/src/System.Memory/ref/System.Memory.cs
@@ -503,6 +503,10 @@ public static partial class MemoryMarshal
         public static System.Collections.Generic.IEnumerable<T> ToEnumerable<T>(ReadOnlyMemory<T> memory) { throw null; }
         public static System.ReadOnlySpan<TTo> Cast<TFrom, TTo>(System.ReadOnlySpan<TFrom> source) where TFrom : struct where TTo : struct { throw null; }
         public static System.Span<TTo> Cast<TFrom, TTo>(System.Span<TFrom> source) where TFrom : struct where TTo : struct { throw null; }
+        public static bool TryGetArray<T>(in System.Buffers.ReadOnlySequence<T> sequence, out System.ArraySegment<T> array) { throw null; }
+        public static bool TryGetMemoryList<T>(in System.Buffers.ReadOnlySequence<T> sequence, out System.Buffers.IMemoryList<T> startSegment, out int startIndex, out System.Buffers.IMemoryList<T> endSegment, out int endIndex) { throw null; }
+        public static bool TryGetOwnedMemory<T>(in System.Buffers.ReadOnlySequence<T> sequence, out System.Buffers.OwnedMemory<T> ownedMemory, out int start, out int length) { throw null; }
+        public static bool TryGetReadOnlyMemory<T>(in System.Buffers.ReadOnlySequence<T> sequence, out System.ReadOnlyMemory<T> readOnlyMemory) { throw null; }
 #if !FEATURE_PORTABLE_SPAN
         public static System.ReadOnlySpan<T> CreateReadOnlySpan<T>(ref T reference, int length) { throw null; }
         public static System.Span<T> CreateSpan<T>(ref T reference, int length) { throw null; }
diff --git a/src/System.Memory/src/System/Runtime/InteropServices/MemoryMarshal.ReadOnlySequence.cs b/src/System.Memory/src/System/Runtime/InteropServices/MemoryMarshal.ReadOnlySequence.cs
index bdcfecb117e4..1cc3ee40e05f 100644
--- a/src/System.Memory/src/System/Runtime/InteropServices/MemoryMarshal.ReadOnlySequence.cs
+++ b/src/System.Memory/src/System/Runtime/InteropServices/MemoryMarshal.ReadOnlySequence.cs
@@ -6,6 +6,10 @@
 
 namespace System.Runtime.InteropServices
 {
+    /// <summary>
+    /// Provides a collection of methods for interoperating with <see cref="Memory{T}"/>, <see cref="ReadOnlyMemory{T}"/>,
+    /// <see cref="Span{T}"/>, and <see cref="ReadOnlySpan{T}"/>.
+    /// </summary>
     public static partial class MemoryMarshal
     {
         /// <summary>