From a0ec0fe40240f8737bae4692b618c534bb4cd2a4 Mon Sep 17 00:00:00 2001
From: Lee Rowlands <lee.rowlands@previousnext.com.au>
Date: Tue, 6 Jan 2015 19:37:09 +1000
Subject: [PATCH] Add comment as requested

---
 src/Symfony/Component/Yaml/Escaper.php | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Symfony/Component/Yaml/Escaper.php b/src/Symfony/Component/Yaml/Escaper.php
index e3039f57e9..be846e50c7 100644
--- a/src/Symfony/Component/Yaml/Escaper.php
+++ b/src/Symfony/Component/Yaml/Escaper.php
@@ -108,6 +108,8 @@ class Escaper
      */
     private static function isValueRequiresSingleQuoting($value)
     {
+        // Note that whilst 'y' and 'n' are not supported as valid Booleans,
+        // they are escaped here for interoperability.
         return in_array(strtolower($value), array('null', '~', 'true', 'false', 'y', 'n', 'yes', 'no', 'on', 'off'));
     }
 }