From 8de36cc08f2e1887f18954e0f32f5a3ca7a2e33c Mon Sep 17 00:00:00 2001
From: Steve Clay <steve@mrclay.org>
Date: Thu, 24 Jul 2008 00:51:54 +0000
Subject: [PATCH] Clarified comment.

---
 lib/HTTP/ConditionalGet.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/HTTP/ConditionalGet.php b/lib/HTTP/ConditionalGet.php
index d95120f..47b6932 100644
--- a/lib/HTTP/ConditionalGet.php
+++ b/lib/HTTP/ConditionalGet.php
@@ -220,7 +220,9 @@ class HTTP_ConditionalGet {
     protected function _isCacheValid()
     {
         if (null === $this->_etag) {
-            // ETag was our backup, so we know we don't have lmTime either
+            // lmTime is copied to ETag, so this condition implies that the
+            // client received neither ETag nor Last-Modified, so can't 
+            // possibly has a valid cache.
             return false;
         }
         $isValid = ($this->resourceMatchedEtag() || $this->resourceNotModified());