diff --git a/after/ftplugin/markdown.vim b/after/ftplugin/markdown.vim
index 09b4f4c..f0b9d80 100644
--- a/after/ftplugin/markdown.vim
+++ b/after/ftplugin/markdown.vim
@@ -14,3 +14,31 @@ xnoremap <buffer><silent> ic :<C-U>call text_obj#MdCodeBlock('i')<CR>
 xnoremap <buffer><silent> ac :<C-U>call text_obj#MdCodeBlock('a')<CR>
 onoremap <buffer><silent> ic :<C-U>call text_obj#MdCodeBlock('i')<CR>
 onoremap <buffer><silent> ac :<C-U>call text_obj#MdCodeBlock('a')<CR>
+
+" Use + to turn several lines to an unordered list.
+nnoremap <buffer><silent> + :set operatorfunc=AddListSymbol<CR>g@
+xnoremap <buffer><silent> + :<C-U> call AddListSymbol(visualmode(), 1)<CR>
+
+function! AddListSymbol(type, ...) abort
+  if a:0
+    let line_start = line("'<")
+    let line_end = line("'>")
+  else
+    let line_start = line("'[")
+    let line_end = line("']")
+  endif
+
+  " add list symbol to each line
+  for line in range(line_start, line_end)
+    let text = getline(line)
+
+    let end = matchend(text, '^\s*')
+    if end == 0
+      let new_text = '+ ' . text
+    else
+      let new_text = text[0:end-1] . ' + ' . text[end:]
+    endif
+
+    call setline(line, new_text)
+  endfor
+endfunction