diff --git a/src/Avalonia.Base/Metadata/TemplateDataTypeAttribute.cs b/src/Avalonia.Base/Metadata/TemplateDataTypeAttribute.cs
index 29e8cf4a06..51899bd03c 100644
--- a/src/Avalonia.Base/Metadata/TemplateDataTypeAttribute.cs
+++ b/src/Avalonia.Base/Metadata/TemplateDataTypeAttribute.cs
@@ -2,6 +2,9 @@
 
 namespace Avalonia.Metadata;
 
+/// <summary>
+/// Defines the property that contains type of the data passed to the <see cref="IDataTemplate"/> implementation.
+/// </summary>
 [AttributeUsage(AttributeTargets.Property)]
 public class TemplateDataTypeAttribute : Attribute
 {