diff --git a/src/Infrastructure/BotSharp.Abstraction/Files/Models/BotSharpFile.cs b/src/Infrastructure/BotSharp.Abstraction/Files/Models/BotSharpFile.cs
index 9581b83f..de226f58 100644
--- a/src/Infrastructure/BotSharp.Abstraction/Files/Models/BotSharpFile.cs
+++ b/src/Infrastructure/BotSharp.Abstraction/Files/Models/BotSharpFile.cs
@@ -6,6 +6,9 @@ public class BotSharpFile
     [JsonPropertyName("file_name")]
     public string FileName { get; set; } = string.Empty;
 
+    /// <summary>
+    /// File data, e.g., "data:image/png;base64,aaaaaaaa"
+    /// </summary>
     [JsonPropertyName("file_data")]
     public string FileData { get; set; } = string.Empty;