doc/ex/roll.rb in rmagick-2.16.0 vs doc/ex/roll.rb in rmagick-3.0.0

@@ -1,9 +1,9 @@
 #!/usr/bin/env ruby -w
 require 'rmagick'
 
 img = Magick::Image.read('images/Flower_Hat.jpg').first
 
-img = img.roll(img.columns/4, img.rows/4)
+img = img.roll(img.columns / 4, img.rows / 4)
 
 img.write('roll.jpg')
 exit