diff --git a/src/Composer/Installer.php b/src/Composer/Installer.php
index a0e365ded..71fa13d9b 100644
--- a/src/Composer/Installer.php
+++ b/src/Composer/Installer.php
@@ -624,6 +624,7 @@ class Installer
             $localRepo->write();
         }
 
+        // see https://github.com/composer/composer/issues/2764
         if ($operations) {
             $vendorDir = $this->config->get('vendor-dir');
             if (is_dir($vendorDir)) {