diff --git a/.config/nvim/init.vim b/.config/nvim/init.vim
index 90873baa..ad9ae4bd 100644
--- a/.config/nvim/init.vim
+++ b/.config/nvim/init.vim
@@ -111,6 +111,24 @@ set clipboard+=unnamedplus
 " Update binds when sxhkdrc is updated.
 	autocmd BufWritePost *sxhkdrc !pkill -USR1 sxhkd
 " coc stuff
+set nobackup
+set nowritebackup
+
+" Use tab for trigger completion with characters ahead and navigate.
+" Use command ':verbose imap <tab>' to make sure tab is not mapped by other plugin.
+inoremap <silent><expr> <TAB>
+      \ pumvisible() ? "\<C-n>" :
+      \ <SID>check_back_space() ? "\<TAB>" :
+      \ coc#refresh()
+inoremap <expr><S-TAB> pumvisible() ? "\<C-p>" : "\<C-h>"
+
+function! s:check_back_space() abort
+  let col = col('.') - 1
+  return !col || getline('.')[col - 1]  =~# '\s'
+endfunction
+
+
+
 " You will have bad experience for diagnostic messages when it's default 4000.
 set updatetime=300