From 7a0309b5dd37acb30321716794fba4449b374add Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sun, 3 Dec 2017 14:26:11 +0200
Subject: Add few clarifying comments

---
 build2/variable.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'build2/variable.cxx')

diff --git a/build2/variable.cxx b/build2/variable.cxx
index 8d9aa14..ce88712 100644
--- a/build2/variable.cxx
+++ b/build2/variable.cxx
@@ -1135,7 +1135,7 @@ namespace build2
 
     variable& r (p.first->second);
 
-    if (!p.second)
+    if (!p.second) // Note: overridden variable will always exist.
     {
       if (t != nullptr || v != nullptr || o != nullptr)
         update (r, t, v, o); // Not changing the key.
-- 
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