diff --git a/badges/lib/backpacklib.php b/badges/lib/backpacklib.php
index 384a2d26c243c..a32e67f143026 100644
--- a/badges/lib/backpacklib.php
+++ b/badges/lib/backpacklib.php
@@ -66,6 +66,7 @@ public function curl_request($action, $collection = null) {
             'FORBID_REUSE'      => true,
             'HEADER'            => 0,
             'CONNECTTIMEOUT'    => 3,
+            // Follow redirects with the same type of request when sent 301, or 302 redirects.
             'CURLOPT_POSTREDIR' => 3
         );