From 952fd7a7561c5166dfd311d3f153b488d307e58e Mon Sep 17 00:00:00 2001
From: Victor Zverovich <victor.zverovich@gmail.com>
Date: Mon, 19 May 2014 07:30:32 -0700
Subject: [PATCH] Comment.

---
 test/gtest-extra.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/gtest-extra.h b/test/gtest-extra.h
index 619b6f22..1c5e373d 100644
--- a/test/gtest-extra.h
+++ b/test/gtest-extra.h
@@ -107,6 +107,7 @@ std::string FormatSystemErrorMessage(int error_code, fmt::StringRef message);
 # endif
 #endif
 
+// Calls to system functions are wrapped in FMT_SYSTEM for testability.
 #ifdef FMT_SYSTEM
 # define FMT_POSIX_CALL(call) FMT_SYSTEM(call)
 #else