diff --git a/examples/negative.html b/examples/negative.html
index 073ae6a..d1ee1a2 100644
--- a/examples/negative.html
+++ b/examples/negative.html
@@ -28,7 +28,8 @@ Morris.Line({
data: neg_data,
xkey: 'period',
ykeys: ['a'],
- labels: ['Series A']
+ labels: ['Series A'],
+ units: '%'
});