diff --git a/config/plugins/denite.vim b/config/plugins/denite.vim
index 998e43f3d..336977f99 100644
--- a/config/plugins/denite.vim
+++ b/config/plugins/denite.vim
@@ -52,7 +52,7 @@ else
     " For Pt(the platinum searcher)
     " NOTE: It also supports windows.
     call denite#custom#var('file_rec', 'command',
-          \ ['pt', '--follow', '--nocolor', '--nogroup', '-g:', ''])
+          \ ['pt', '--follow', '--nocolor', '-g=', '.'])
   endif
 endif
 
diff --git a/docs/_posts/2018-01-23-grep-on-the-fly-in-spacevim.md b/docs/_posts/2018-01-23-grep-on-the-fly-in-spacevim.md
index 4bdc1a5db..6971668e9 100644
--- a/docs/_posts/2018-01-23-grep-on-the-fly-in-spacevim.md
+++ b/docs/_posts/2018-01-23-grep-on-the-fly-in-spacevim.md
@@ -15,6 +15,14 @@ through search tools: `ag`, `rg`, `ack`, `pt` and `grep`, Choose one you like.
 
 This ia a built-in plugin in SpaceVim, and we also separated a plugin : [FlyGrep.vim](https://github.com/wsdjeg/FlyGrep.vim)
 
+## Install
+
+In linux os, flygrep use grep by default, if you want a more fast tool, you can choose one of following:
+
+- [ripgrep(rg)](https://github.com/BurntSushi/ripgrep)
+- [the_silver_searcher(ag)](https://github.com/ggreer/the_silver_searcher)
+- [the_platinum_searcher(pt)](https://github.com/monochromegane/the_platinum_searcher)
+
 ## Features
 
 - **Search in a project**