diff --git a/config_files/.vimrc b/config_files/.vimrc
index bc8ceb6..51ca811 100644
--- a/config_files/.vimrc
+++ b/config_files/.vimrc
@@ -82,12 +82,11 @@ let g:netrw_liststyle = 3
 
 
 "---------------------------------------------------------------
-" to use the syntax highlight of .hpp on .tpp files
+" to use the syntax highlight of .ext on .ext2 files
 "---------------------------------------------------------------
-"https://beerpla.net/2008/04/02/how-to-add-a-vim-file-extension-to-syntax-highlighting/
 
-filetype on
-au BufNewFile,BufRead *.tpp set filetype=cpp
+au BufRead *.tpp    set syntax=cpp
+au BufRead *.svelte set syntax=html
 
 
 
@@ -149,6 +148,7 @@ inoremap <Down> <C-o>gj
 inoremap <Up> <C-o>gk
 
 
+
 "---------------------------------------------------------------
 " put swap files in a special directory
 "---------------------------------------------------------------
@@ -168,6 +168,36 @@ set directory=~/.vim/swapfiles//
 
 
 
+"---------------------------------------------------------------
+" put swap files in a special directory
+"---------------------------------------------------------------
+
+" https://stackoverflow.com/questions/1676632/whats-a-quick-way-to-comment-uncomment-lines-in-vim#answer-67151825
+
+" " version 1 :
+" autocmd FileType c,cpp,java,scala let b:comment_leader = '//'
+" autocmd FileType sh,ruby,python   let b:comment_leader = '#'
+" autocmd FileType conf,fstab       let b:comment_leader = '#'
+" autocmd FileType tex              let b:comment_leader = '%'
+" autocmd FileType mail             let b:comment_leader = '>'
+" autocmd FileType vim              let b:comment_leader = '"'
+" function! CommentToggle()
+" 	execute ':silent! s/\([^ ]\)/' . escape(b:comment_leader,'\/') . ' \1/'
+" 	execute ':silent! s/^\( *\)' . escape(b:comment_leader,'\/') . ' \?' . escape(b:comment_leader,'\/') . ' \?/\1/'
+" endfunction
+" map <F7> :call CommentToggle()<CR>
+"
+" " version 2
+" function CommentUncomment()
+" 	let line = getline('.')
+" 	if line[:1] == '//'
+" 		norm ^2x
+" 	else 
+" 		norm I//
+" 	endif
+" endfunction
+" nnoremap <Space><Space> :call CommentUncomment()<CR>
+
 "---------------------------------------------------------------
 " to autofill new files
 "---------------------------------------------------------------