From 5c926c54e2d215f2797242b057eab979b07de3b7 Mon Sep 17 00:00:00 2001
From: Andrew Kesterson <andrew@aklabs.net>
Date: Tue, 20 May 2014 09:24:31 -0700
Subject: [PATCH] Update UPGRADING.md

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

diff --git a/UPGRADING.md b/UPGRADING.md
index 927694e..5fa7d6d 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -9,10 +9,10 @@ In 1.0, argument validators were a somewhat documented, but unpublished feature
 
     cmdarg 'x' 'some-arg' 'some description' '' 'echo $OPTARG | grep ...'
 
-... To this format:
+... To this format, which will work in both 1.0 and 2.0 versions:
 
     function my_grep_validator {
-        echo $1 | grep ...
+        echo ${1:-$OPTARG} | grep ...
     }
 
     cmdarg 'x' 'some-arg' 'some description' '' my_grep_validator