diff --git a/docs/usage.md b/docs/usage.md
index 99a38791..f44d8f77 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -392,6 +392,8 @@ bool ok = httpClient.performRequest(args, [](const HttpResponsePtr& response)
 // ok will be false if your httpClient is not async
 ```
 
+See this [issue](https://github.com/machinezone/IXWebSocket/issues/209) for links about uploading files with HTTP multipart.
+
 ## HTTP server API
 
 ```cpp