diff --git a/autoload/SpaceVim/mapping/space.vim b/autoload/SpaceVim/mapping/space.vim
index 35b841e31..36dfe842a 100644
--- a/autoload/SpaceVim/mapping/space.vim
+++ b/autoload/SpaceVim/mapping/space.vim
@@ -20,6 +20,7 @@ function! SpaceVim#mapping#space#init() abort
     let g:_spacevim_mappings_space.h = {'name' : '+Help'}
     let g:_spacevim_mappings_space.l = {'name' : '+Language Specified'}
     let g:_spacevim_mappings_space.s = {'name' : '+Searching'}
+    let g:_spacevim_mappings_space.r = {'name' : '+Registers/rings/resume'}
     " Windows
     for i in range(1, 9)
         exe "call SpaceVim#mapping#space#def('nnoremap', [" . i . "], 'call SpaceVim#layers#core#statusline#jump(" . i . ")', 'window " . i . "', 1)"
@@ -71,6 +72,7 @@ function! SpaceVim#mapping#space#init() abort
     call SpaceVim#mapping#menu('toggle line number', '[SPC]tn', 'set nu!')
     call SpaceVim#mapping#space#def('nnoremap', ['b', 'b'], 'Unite buffer', 'buffer list', 1)
     call extend(g:_spacevim_mappings_prefixs['[SPC]'], get(g:, '_spacevim_mappings_space', {}))
+    call SpaceVim#mapping#space#def('nnoremap', ['r', 'l'], 'Unite resume', 'resume unite buffer', 1)
 endfunction
 
 function! SpaceVim#mapping#space#def(m, keys, cmd, desc, is_cmd) abort
diff --git a/config/plugins/unite.vim b/config/plugins/unite.vim
index fc476eb01..4e6e0fd57 100644
--- a/config/plugins/unite.vim
+++ b/config/plugins/unite.vim
@@ -199,9 +199,14 @@ elseif executable('ag')
   " Use ag (the silver searcher)
   " https://github.com/ggreer/the_silver_searcher
   let g:unite_source_grep_command = 'ag'
-  let g:unite_source_grep_default_opts = '-i --line-numbers --nocolor --nogroup --hidden --ignore ' .
+  let g:unite_source_grep_default_opts =
+        \ '-i --vimgrep --hidden --ignore ' .
         \ '''.hg'' --ignore ''.svn'' --ignore ''.git'' --ignore ''.bzr'''
   let g:unite_source_grep_recursive_opt = ''
+elseif executable('rg') && 0
+  let g:unite_source_grep_command = 'rg'
+  let g:unite_source_grep_default_opts = ''
+  let g:unite_source_grep_recursive_opt = ''
 elseif executable('pt')
   " Use pt (the platinum searcher)
   " https://github.com/monochromegane/the_platinum_searcher
diff --git a/docs/documentation.md b/docs/documentation.md
index 24f6096ba..e9e0559ff 100644
--- a/docs/documentation.md
+++ b/docs/documentation.md
@@ -68,6 +68,8 @@ title:  "Documentation"
     * [Auto-saving](#auto-saving)
     * [Searching](#searching)
         * [With an external tool](#with-an-external-tool)
+        * [Useful key bindings](#useful-key-bindings)
+        * [Searching in current file](#searching-in-current-file)
     * [Editing](#editing)
         * [Multi-Encodings](#multi-encodings)
     * [Errors handling](#errors-handling)
@@ -953,7 +955,30 @@ It is possible to search in the current file by double pressing the second key o
 Notes:
 
 - `rg`, `ag` and `pt` are optimized to be used in a source control repository but they can be used in an arbitrary directory as well.
-- It is also possible to search in several directories at once by marking them in the unite buffer (not available in Ivy).
+- It is also possible to search in several directories at once by marking them in the unite buffer.
+
+**Beware** if you use `pt`, [TCL parser tools](https://core.tcl.tk/tcllib/doc/trunk/embedded/www/tcllib/files/apps/pt.html) also install a command line tool called `pt`.
+
+#### Useful key bindings
+
+Key Binding | Description
+-----------| -----------
+`SPC r l` | resume the last completion buffer
+`` SPC s ` `` | go back to the previous place before jump
+Prefix argument | will ask for file extensions
+
+#### Searching in current file
+
+Key Binding	Description
+-----------| -----------
+`SPC s s` | search with the first found tool
+`SPC s S` | search with the first found tool with default input
+`SPC s a a` | ag
+`SPC s a A` | ag with default input
+`SPC s g g` | grep
+`SPC s g G` | grep with default input
+`SPC s r r` | rg
+`SPC s r R` | rg with default input
 
 ### Editing