syntax highlight problem

Hi,

After Testing a syntax pattern highlight in a new file without extension,
I put these lines into vimruntime\syntax\cs.vim



" Custom Class add !!!!!!!!!!
syn match csCustomClass "class\_s\+\zs\<\w\+\>"

" Custom Class add !!!!!!!!!!
hi def link csCustomClass Function




It fails to highlight pattern like in the new file without extension with this content :


public class Foo




--
--
You received this message from the "vim_use" maillist.
Do not top-post! Type your reply below the text you are replying to.
For more information, visit http://www.vim.org/maillist.php

---
You received this message because you are subscribed to the Google Groups "vim_use" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vim_use+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.