diff --git a/.vim/ftdetect/c0-detect.vim b/.vim/ftdetect/c0-detect.vim
index d54c833..94f61ef 100644
--- a/.vim/ftdetect/c0-detect.vim
+++ b/.vim/ftdetect/c0-detect.vim
@@ -1,3 +1,5 @@
 " place in .vim/ftdetect/
 au BufRead,BufNewFile *.c0             set filetype=c0
 au BufRead,BufNewFile *.h0             set filetype=c0
+au BufRead,BufNewFile *.c1             set filetype=c0
+au BufRead,BufNewFile *.h1             set filetype=c0