diff --git a/README.md b/README.md
index 0d5fd27..d89185a 100644
--- a/README.md
+++ b/README.md
@@ -59,6 +59,9 @@ Plug 'neovim/nvim-lspconfig'
 Plug 'ray-x/guihua.lua', {'do': 'cd lua/fzy && make' }
 Plug 'ray-x/navigator.lua'
 
+" optional if you need treesitter symbol support
+Plug 'nvim-treesitter/nvim-treesitter', {'do': ':TSUpdate'}
+
 call plug#end()
 
 lua <<EOF
@@ -75,6 +78,7 @@ Generally speaking, you could remove most part of your lspconfig.lua and use the
 - lspconfig
 - guihua (provides floating window, FZY)
 - Optional:
+  - treesitter (list treesitter symbols)
   - lsp-status
   - lsp-signature
   - vim-illuminate
diff --git a/lua/navigator/gui.lua b/lua/navigator/gui.lua
index 4ed9296..07a3ee7 100644
--- a/lua/navigator/gui.lua
+++ b/lua/navigator/gui.lua
@@ -132,6 +132,7 @@ function M.new_list_view(opts)
             end
             local l = data[pos]
             if l.filename ~= nil then
+              -- log ('openfile ', l.filename, l.lnum)
               util.open_file_at(l.filename, l.lnum)
             end
           end,