diff --git a/README.md b/README.md
index 76da6e0..b78c62f 100644
--- a/README.md
+++ b/README.md
@@ -10,12 +10,14 @@ Easy code navigation.
 - fzy search with Lua-JIT
 - Better navigation for diagnostic errors, Navigate through files that contain errors/warnings
 - Group references/implementation/incomming/outgoing based on file names.
-- Nerdfont for LSP kind
+- Nerdfont, emoji for LSP kind,
 
 # Why a new plugin
 
 After installed a handful of lsp plugins, I still got ~500 loc for lsp and still increasing. Reason is that I need
-to tune the plugins to fit my requirements.
+to tune the plugins to fit my requirements. The plugin help user setup lspconfig with only a few lines of codes.
+Seconde reason is that lots of plugins serve as an enhance version of quickfix, lots of improvement was made by
+[lspsaga](https://github.com/glepnir/lspsaga.nvim), from which, the plugin was inspired.
 
 # Similar projects / special mentions:
 
@@ -28,7 +30,7 @@ to tune the plugins to fit my requirements.
 # Install
 
 You can remove your lspconfig setup and use this plugin.
-The plugin depends on [guihua.lua](https://github.com/ray-x/guihua.lua), which provides gui and fzy support.
+The plugin depends on [guihua.lua](https://github.com/ray-x/guihua.lua), which provides GUI and fzy support.
 
 ```vim
 Plug 'ray-x/guihua.lua', {'do': 'cd lua/fzy && make' }
diff --git a/lua/navigator/diagnostics.lua b/lua/navigator/diagnostics.lua
index 44c3ed5..410ff5d 100644
--- a/lua/navigator/diagnostics.lua
+++ b/lua/navigator/diagnostics.lua
@@ -75,7 +75,7 @@ M.show_diagnostic = function()
     end
     log(display_items)
     if #display_items > 0 then
-      gui.new_list_view({items = display_items, api = 'Diagnostic'})
+      gui.new_list_view({items = display_items, api = '⛑ Diagnostic'})
     end
   end
 end
diff --git a/lua/navigator/gui.lua b/lua/navigator/gui.lua
index 1d79eeb..2211910 100644
--- a/lua/navigator/gui.lua
+++ b/lua/navigator/gui.lua
@@ -40,7 +40,8 @@ function M._preview_location(opts) --location, width, pos_x, pos_y
   --
 
   local range = opts.location.targetRange or opts.location.range
-  local contents = api.nvim_buf_get_lines(bufnr, range.start.line, range["end"].line + 10, false)
+  if range.start == nil then print('error invalid range')  return end
+  local contents = api.nvim_buf_get_lines(bufnr, range.start.line, (range["end"].line or 1) + 10, false)
 
   --
   local syntax = api.nvim_buf_get_option(bufnr, "syntax")
diff --git a/lua/navigator/lspclient/lspkind.lua b/lua/navigator/lspclient/lspkind.lua
index 9c01e9c..dbe87f9 100644
--- a/lua/navigator/lspclient/lspkind.lua
+++ b/lua/navigator/lspclient/lspkind.lua
@@ -29,8 +29,8 @@ local kind_symbols = {
 
 local CompletionItemKind = {
   " ",
-  "ƒ ",
-  " ",
+  "𝔉 ",
+  "ⓕ ",
   " ",
   "ﴲ ",
   " ",
@@ -40,7 +40,7 @@ local CompletionItemKind = {
   " ",
   " ",
   " ",
-  "了",
+  "𝕰 ",
   " ",
   "﬌ ",
   " ",