---
title: A note on the Metadata property
description: The C# EcsDocument type includes a property called Metadata with the signature: This property is not part of the ECS specification, but is included as...
url: https://www.elastic.co/elastic/docs-builder/docs/3016/reference/ecs/logging/dotnet/intro_to_xyz
products:
  - ECS Logging
  - ECS Logging .NET
---

# A note on the Metadata property
The C# `EcsDocument` type includes a property called `Metadata` with the signature:
```csharp
/// <summary>
/// Container for additional metadata against this event.
/// </summary>
[JsonPropertyName("metadata"), DataMember(Name = "metadata")]
public IDictionary<string, object> Metadata { get; set; }
```

This property is not part of the ECS specification, but is included as a means to index supplementary information.