diff --git a/doc/vinegar.txt b/doc/vinegar.txt
index 44d419e..0798487 100644
--- a/doc/vinegar.txt
+++ b/doc/vinegar.txt
@@ -13,7 +13,13 @@ MAPPINGS                                        *vinegar-mappings*
                                                 *vinegar--*
 -                       Open the parent directory of the current file.  This
                         is the only mapping available outside of netrw
-                        buffers.
+                        buffers. If you have already mapped - to somthing else,
+                        you'll need to map one of these plugs:
+
+                        <Plug>VinegarUp
+                        <Plug>VinegarTabUp
+                        <Plug>VinegarSplitUp
+                        <Plug>VinegarVerticalSplitUp
 
                                                 *vinegar-~*
 ~                       Open $HOME.
diff --git a/plugin/vinegar.vim b/plugin/vinegar.vim
index 168b09a..7fdd60f 100644
--- a/plugin/vinegar.vim
+++ b/plugin/vinegar.vim
@@ -28,14 +28,17 @@ endif
 unlet! s:netrw_up
 
 nnoremap <silent> <Plug>VinegarUp :call <SID>opendir('edit')<CR>
-if empty(maparg('-', 'n'))
-  nmap - <Plug>VinegarUp
-endif
-
 nnoremap <silent> <Plug>VinegarTabUp :call <SID>opendir('tabedit')<CR>
 nnoremap <silent> <Plug>VinegarSplitUp :call <SID>opendir('split')<CR>
 nnoremap <silent> <Plug>VinegarVerticalSplitUp :call <SID>opendir('vsplit')<CR>
 
+if empty(mapcheck('-', 'n')) && !hasmapto('<Plug>VinegarUp') &&
+      \                         !hasmapto('<Plug>VinegarSplitUp') &&
+      \                         !hasmapto('<Plug>VinegarVerticalSplitUp') &&
+      \                         !hasmapto('<Plug>VinegarTabUp')
+  nmap - <Plug>VinegarUp
+endif
+
 function! s:opendir(cmd) abort
   let df = ','.s:dotfiles
   if expand('%:t')[0] ==# '.' && g:netrw_list_hide[-strlen(df):-1] ==# df