diff --git a/csharp/src/Google.Protobuf/ByteString.cs b/csharp/src/Google.Protobuf/ByteString.cs
index 4d75ff9dfa88..2619be5bef2d 100644
--- a/csharp/src/Google.Protobuf/ByteString.cs
+++ b/csharp/src/Google.Protobuf/ByteString.cs
@@ -58,7 +58,7 @@ public sealed class ByteString : IEnumerable<byte>, IEquatable<ByteString>
         private readonly ReadOnlyMemory<byte> bytes;
 
         /// <summary>
-        /// Internal use only.  Ensure that the provided array is not mutated and belongs to this instance.
+        /// Internal use only. Ensure that the provided memory is not mutated and belongs to this instance.
         /// </summary>
         internal static ByteString AttachBytes(ReadOnlyMemory<byte> bytes)
         {
@@ -66,7 +66,7 @@ internal static ByteString AttachBytes(ReadOnlyMemory<byte> bytes)
         }
 
         /// <summary>
-        /// Constructs a new ByteString from the given byte array. The array is
+        /// Constructs a new ByteString from the given memory. The memory is
         /// *not* copied, and must not be modified after this constructor is called.
         /// </summary>
         private ByteString(ReadOnlyMemory<byte> bytes)
@@ -312,7 +312,6 @@ IEnumerator IEnumerable.GetEnumerator()
         public CodedInputStream CreateCodedInput()
         {
             // We trust CodedInputStream not to reveal the provided byte array or modify it
-
             if (MemoryMarshal.TryGetArray(bytes, out ArraySegment<byte> segment) && segment.Count == bytes.Length)
             {
                 // Fast path. ByteString was created with a complete array.
@@ -396,24 +395,6 @@ public bool Equals(ByteString other)
             return this == other;
         }
 
-        /// <summary>
-        /// Used internally by CodedOutputStream to avoid creating a copy for the write
-        /// </summary>
-        internal void WriteRawBytesTo(CodedOutputStream outputStream)
-        {
-            if (MemoryMarshal.TryGetArray(bytes, out ArraySegment<byte> segment))
-            {
-                // Fast path. ByteString was created with an array, so pass the underlying array.
-                outputStream.WriteRawBytes(segment.Array, segment.Offset, segment.Count);
-            }
-            else
-            {
-                // Slow path. BytesString is not an array. Convert memory and pass result to WriteRawBytes.
-                // TODO: Consider CodedOutputStream.WriteRawBytes(ReadOnlyMemory<bytes>) overload.
-                outputStream.WriteRawBytes(bytes.ToArray());
-            }
-        }
-
         /// <summary>
         /// Copies the entire byte array to the destination array provided at the offset specified.
         /// </summary>