diff --git a/data/vim/map.vim b/data/vim/map.vim
index 0cdd525..d3cb354 100644
--- a/data/vim/map.vim
+++ b/data/vim/map.vim
@@ -6,6 +6,9 @@ let mapleader = "s"
 " usually we move to the end of a word to begin editing there
 nnoremap e ea
 
+" toggle list
+nnoremap <F3> :set list!<CR>
+
 " call :make
 nnoremap <leader>m :make<CR>
 
diff --git a/data/vim/option.vim b/data/vim/option.vim
index 0320421..8712eaf 100644
--- a/data/vim/option.vim
+++ b/data/vim/option.vim
@@ -1,13 +1,20 @@
 "" option.vim
 
 set autowrite
-set expandtab
 set path+=/usr/bin,/usr/local/bin
 set secure
-set shiftwidth=4
 set tags+=./tags,tags
 set wildmode=list:longest
 
+" Linux Kernel
+set tabstop=8
+set shiftwidth=8
+set noexpandtab
+set cindent
+" disable indentation for labels
+set cinoptions=:0
+set listchars=tab:>-,trail:·
+
 if has('termguicolors')
     set termguicolors
 endif