diff --git a/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php b/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
index f011ce8d4d..1df2f5014f 100644
--- a/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
+++ b/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
@@ -137,6 +137,7 @@ class RecursiveDirectoryIterator extends \RecursiveDirectoryIterator
             return $this->rewindable;
         }
 
+        // workaround for an HHVM bug, should be removed when https://github.com/facebook/hhvm/issues/7281 is fixed
         if ('' === $this->getPath()) {
             return $this->rewindable = false;
         }