auto-mode-alisp pattern should ends with \\

Hello I'm the maintainer of the sass-mode package for debian and I received this bug: 
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=712279

Doing a little of research  I found that \\ is better than $ to used as ends of a line pattern, see this:

for string ends see: http://www.emacswiki.org/emacs/AutoModeAlist

Thanks