1 files changed, 20 insertions, 3 deletions

diff --git a/src/csharp/Grpc.Core/Marshaller.cs b/src/csharp/Grpc.Core/Marshaller.cs
index 8b1a929074..f38cb0863f 100644
--- a/src/csharp/Grpc.Core/Marshaller.cs
+++ b/src/csharp/Grpc.Core/Marshaller.cs
@@ -37,19 +37,27 @@ using Grpc.Core.Utils;
 namespace Grpc.Core
 {
     /// <summary>
-    /// For serializing and deserializing messages.
+    /// Encapsulates the logic for serializing and deserializing messages.
     /// </summary>
     public struct Marshaller<T>
     {
         readonly Func<T, byte[]> serializer;
         readonly Func<byte[], T> deserializer;
 
+        /// <summary>
+        /// Initializes a new marshaller.
+        /// </summary>
+        /// <param name="serializer">Function that will be used to serialize messages.</param>
+        /// <param name="deserializer">Function that will be used to deserialize messages.</param>
         public Marshaller(Func<T, byte[]> serializer, Func<byte[], T> deserializer)
         {
-            this.serializer = Preconditions.CheckNotNull(serializer);
-            this.deserializer = Preconditions.CheckNotNull(deserializer);
+            this.serializer = Preconditions.CheckNotNull(serializer, "serializer");
+            this.deserializer = Preconditions.CheckNotNull(deserializer, "deserializer");
         }
 
+        /// <summary>
+        /// Gets the serializer function.
+        /// </summary>
         public Func<T, byte[]> Serializer
         {
             get
@@ -58,6 +66,9 @@ namespace Grpc.Core
             }
         }
 
+        /// <summary>
+        /// Gets the deserializer function.
+        /// </summary>
         public Func<byte[], T> Deserializer
         {
             get
@@ -72,11 +83,17 @@ namespace Grpc.Core
     /// </summary>
     public static class Marshallers
     {
+        /// <summary>
+        /// Creates a marshaller from specified serializer and deserializer.
+        /// </summary>
         public static Marshaller<T> Create<T>(Func<T, byte[]> serializer, Func<byte[], T> deserializer)
         {
             return new Marshaller<T>(serializer, deserializer);
         }
 
+        /// <summary>
+        /// Returns a marshaller for <c>string</c> type. This is useful for testing.
+        /// </summary>
         public static Marshaller<string> StringMarshaller
         {
             get