From 07dfd05ddae88d64d012097fb4e275231b2d9312 Mon Sep 17 00:00:00 2001
From: zheng yin <yin.zheng@easystack.cn>
Date: Fri, 23 Sep 2016 11:14:15 +0800
Subject: [PATCH] Add square bracket to option parameter

Because option parameter is not required. I add [] to option parameter.

Change-Id: I27c14c42bf576decff90a4a290dcaad7fab00524
---
 doc/source/command-objects/usage.rst | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/doc/source/command-objects/usage.rst b/doc/source/command-objects/usage.rst
index 0c866086dd..589123a65b 100644
--- a/doc/source/command-objects/usage.rst
+++ b/doc/source/command-objects/usage.rst
@@ -13,8 +13,8 @@ List resource usage per project
 .. code:: bash
 
     os usage list
-        --start <start>
-        --end <end>
+        [--start <start>]
+        [--end <end>]
 
 .. option:: --start <start>
 
@@ -33,9 +33,9 @@ Show resource usage for a single project
 .. code:: bash
 
     os usage show
-        --project <project>
-        --start <start>
-        --end <end>
+        [--project <project>]
+        [--start <start>]
+        [--end <end>]
 
 .. option:: --project <project>