diff --git a/src/Composer/Console/Application.php b/src/Composer/Console/Application.php
index cc7f61d9a..77ac06377 100644
--- a/src/Composer/Console/Application.php
+++ b/src/Composer/Console/Application.php
@@ -131,6 +131,7 @@ class Application extends BaseApplication
 
         if (
             getenv('COMPOSER_NO_INTERACTION')
+            /* @see \Composer\Util\ProcessExecutor::executeTty - tty test */
             || (function_exists('stream_isatty') && !stream_isatty(STDOUT))
             || (function_exists('posix_isatty') && !posix_isatty(STDOUT))
         ) {
diff --git a/src/Composer/Util/ProcessExecutor.php b/src/Composer/Util/ProcessExecutor.php
index 6f557b9c9..1f55f6144 100644
--- a/src/Composer/Util/ProcessExecutor.php
+++ b/src/Composer/Util/ProcessExecutor.php
@@ -78,6 +78,7 @@ class ProcessExecutor
     public function executeTty($command, $cwd = null)
     {
         if (
+            /* @see \Composer\Console\Application::doRun - tty test */
             (function_exists('stream_isatty') && !stream_isatty(STDOUT))
             || (function_exists('posix_isatty') && !posix_isatty(STDOUT))
         ) {