diff --git a/proxy.php b/proxy.php
index 60d00d0..361aafd 100644
--- a/proxy.php
+++ b/proxy.php
@@ -8,6 +8,11 @@ use Phly\Http\Response;
 
 require __DIR__.'/vendor/autoload.php';
 
+/**
+ * Sends an HTTP response.
+ *
+ * @param Response $response
+ */
 function send(Response $response)
 {
     http_response_code($response->getStatusCode());
@@ -19,6 +24,14 @@ function send(Response $response)
     echo $response->getBody();
 }
 
+/**
+ * Does a request to the API of Bittrex.
+ *
+ * @param ServerRequest $request
+ * @param Client        $client
+ *
+ * @return \GuzzleHttp\Psr7\Response
+ */
 function doRequest(ServerRequest $request, Client $client)
 {
     $headers = [];