diff --git a/src/LeanCode.Contracts/Validation/ValidationError.cs b/src/LeanCode.Contracts/Validation/ValidationError.cs
index 54fc6d3..1d172e1 100644
--- a/src/LeanCode.Contracts/Validation/ValidationError.cs
+++ b/src/LeanCode.Contracts/Validation/ValidationError.cs
@@ -1,8 +1,9 @@
 namespace LeanCode.Contracts.Validation;
 
-public class ValidationError(string propertyName, string errorMessage, int errorCode)
+public class ValidationError(string propertyName, string errorMessage, int errorCode, string? errorName = null)
 {
     public string PropertyName { get; } = propertyName;
     public string ErrorMessage { get; } = errorMessage;
     public int ErrorCode { get; } = errorCode;
+    public string? ErrorName { get; } = errorName;
 }
diff --git a/src/LeanCode.ContractsGenerator.Tests/Serialization/CommandResultSerializationTests.cs b/src/LeanCode.ContractsGenerator.Tests/Serialization/CommandResultSerializationTests.cs
index 47d2b03..7283720 100644
--- a/src/LeanCode.ContractsGenerator.Tests/Serialization/CommandResultSerializationTests.cs
+++ b/src/LeanCode.ContractsGenerator.Tests/Serialization/CommandResultSerializationTests.cs
@@ -9,7 +9,7 @@ namespace LeanCode.ContractsGenerator.Tests.Serialization;
 public class CommandResultSerializationTests
 {
     private static readonly CommandResult SampleCommandResult = CommandResult.NotValid(
-        new([new ValidationError("A property", "An error message", 1)])
+        new([new ValidationError("A property", "An error message", 1, "ErrorCodeName")])
     );
 
     private const string Json = $$"""
@@ -18,7 +18,8 @@ public class CommandResultSerializationTests
             {
               "{{nameof(ValidationError.PropertyName)}}": "A property",
               "{{nameof(ValidationError.ErrorMessage)}}": "An error message",
-              "{{nameof(ValidationError.ErrorCode)}}": 1
+              "{{nameof(ValidationError.ErrorCode)}}": 1,
+              "{{nameof(ValidationError.ErrorName)}}": "ErrorCodeName"
             }
           ],
           "{{nameof(CommandResult.WasSuccessful)}}": false