From 9ba5d19454833185a6be878e146753a4ba0d3716 Mon Sep 17 00:00:00 2001
From: Mingye Wang <arthur200126@gmail.com>
Date: Fri, 25 Sep 2015 10:16:37 -0400
Subject: [PATCH] Updated SC2039 (markdown)

---
 SC2039.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/SC2039.md b/SC2039.md
index 82bcbfa..cbde9c2 100644
--- a/SC2039.md
+++ b/SC2039.md
@@ -70,8 +70,8 @@ Bash:
 POSIX:
 
 ```sh
-: $((a=c+d))
-[ $((d)) -ne 0 ] && echo d is true.
+: $((a=c+d)) # discard the output of the arith expn with `:` command
+[ $((d)) -ne 0 ] && echo d is true. # manually check non-zero => true
 ```
 
 ### `select` loops