diff --git a/src/tracker/client.ts b/src/tracker/client.ts
index 9a52674..d2fad3f 100644
--- a/src/tracker/client.ts
+++ b/src/tracker/client.ts
@@ -111,8 +111,15 @@ export class TrackerClient {
     return this.request('GET', `/api/v1/messages?${qs}`);
   }
 
-  // --- Files ---
-  // TODO: file upload/download not implemented yet in Tracker
+  // --- Files (Attachments) ---
+  // Files are attachments on Messages. To attach a file to a task,
+  // send a message with task_id + attachment.
+  // Upload endpoint: POST /api/v1/messages/{id}/attachments (TODO in Tracker)
+  // Download endpoint: GET /api/v1/attachments/{id} (TODO in Tracker)
+
+  // async uploadAttachment(messageId: string, filename: string, data: Buffer): Promise<Record<string, unknown>> {
+  //   return this.request('POST', `/api/v1/messages/${messageId}/attachments`, ...);
+  // }
 
   // --- Projects ---