I use cryogen with asciidoc and want to associate .asc files with asciidoc layer / adoc-mode Is https://emacs.stackexchange.com/questions/17887/how-do-i-associate-a-file-extension-with-a-specific-mode how you do it?

(add-to-list 'auto-mode-alist '("\\.asc\\'" . adoc-mode))