diff --git a/README.md b/README.md
index c4760db..0542064 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,6 @@ There is a more detailed list of what the ZeroQL can do at the moment:
 - [x] [Support for unions](#unions)
 - [x] [Support for file uploads](#file-upload)
 - [x] [Support for persisted queries](#persisted-queries)
-- [x] [Support for user defined scalars](#user-defined-scalars)
 - [ ] Support for @defer
 - [ ] Support for @stream
 
@@ -390,59 +389,6 @@ The `` queries `` folder will contain the set of the "hashed" GraphQL files that
 21cc96eaf0c0db2b5f980c8ec8b5aba2e40eb24f370cfc0cd7e4825509742ae2.graphql # mutation AddAvatar($id: Int!, $file: Upload!) { addUserProfileImage(userId: $id, file: $file)}
 ```
 
-# User defined scalars
-
-Let's suppose that server returns the `` Instant `` type from `` NodaTime ``.
-The schema looks like that
-``` graphql
-
-"""
-Represents an instant on the global timeline, with nanosecond resolution.
-"""
-scalar Instant
-
-type Query {
-  instant: Instant!
-}
-```
-
-The ZeroQL knows nothing about the scalar type `` Instant ``, but we should be able to add support for it. To make it work, create the class `` Instant `` in the ZeroQL namespace and define a JSON serializer for it:
-``` cs
-namespace ZeroQL;
-
-public class Instant
-{
-    public DateTimeOffset DateTimeOffset { get; set; }
-}
-
-public class InstantJsonConverter : JsonConverter<Instant?>
-{
-    public override Instant? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
-    {
-        var text = reader.GetString();
-        if (string.IsNullOrEmpty(text))
-        {
-            return null;
-        }
-        return new Instant { DateTimeOffset = DateTimeOffset.Parse(text) };
-    }
-
-    public override void Write(Utf8JsonWriter writer, Instant? value, JsonSerializerOptions options)
-    {
-        var text = value?.DateTimeOffset.ToString("O");
-        writer.WriteStringValue(text);
-    }
-}
-```
-
-Then, somewhere in your app, add this serializer to JSON options:
-``` cs
-ZeroQLJsonOptions.Configure(o => o.Converters.Add(new InstantJsonConverter()));
-```
-Now we are ready to consume it:
-``` cs
-var response = await qlClient.Query(static q => q.Instant);
-```
 
 # Benchmarks