diff --git a/README.md b/README.md
index 90f5b84..2359072 100644
--- a/README.md
+++ b/README.md
@@ -259,9 +259,68 @@ require("wf").setup({
 
 <p align="right">(<a href="#readme-top">back to top</a>)</p>
 
-## Wiki
+## Document
 
-You can find guides and showcase of the plugin on [the Wiki](https://github.com/cassin/wf.nvim/wiki)
+You can find guides the plugin on [the docs](https://github.com/Cassin01/wf.nvim/blob/main/doc/wf.txt)
+
+<p align="right">(<a href="#readme-top">back to top</a>)</p>
+
+## Tips
+
+### Holding specific key pattern on which_key
+
+It may be a bit arrogant to call it tips, but here is my init.lua setup.
+
+```lua
+-- setup table for prefixes
+---------------------------------------
+if _G.__key_prefixes == nil then
+  _G.__key_prefixes = {
+    n = {},
+    i = {},
+  }
+end
+
+-- utility function for setting keymaps
+---------------------------------------
+local function nmaps(prefix, desc, tbl)
+  local sign = "["..name.."]"
+  table.insert(_G.__key_prefixes["n"], prefix, sign)
+  local set = function(key, cmd, desc, opt)
+    local _opt = opt or {}
+    _opt["desc"] = desc..sign
+    _opt["noremap"] = true
+    vim.keymap.set("n", prefix .. key, cmd, _opt)
+  end
+  for _, v in ipairs(tbl)  do
+    set(unpack tbl)
+  end
+end
+
+
+-- set keymap for each plugins
+---------------------------------------
+
+-- lambdalisue/fern.vim
+nmaps("<space>n", "fern",
+{{"p", "<cmd>Fern . -drawer -toggle<cr>", "open fern on a current working directory"},
+ {"d", "<cmd>Fern %:h -drawer -toggle<cr>", "open fern on a parent directory of a current buffer"}})
+
+-- nvim-telescope/telescope.nvim
+nmaps("<space>t", "telescope"
+{{"f", "<cmd>Telescope find_files<cr>", "find files"},
+ {"g", "<cmd>Telescope live_grep<cr>", "live grep"},
+ {"b", "<cmd>Telescope buffers<cr>", "buffers"},
+ {"h", "<cmd>Telescope help_tags<cr>", "help tags"},
+ {"t", "<cmd>Telescope<cr>", "telescope"},
+ {"o", "<cmd>Telescope oldfiles<cr>", "old files"},
+ {"r", "<cmd>Telescope file_browser<cr>", "file_browser"}})
+
+-- set keymap for calling which-key
+vim.set.keymap("n", "<Space>, which_key({text_insert_in_advance="<space>",
+key_group_dict=_G.__key_prefixes["n"]}), 
+{noremap = true, silent = tre, desc = "which-key space", nowait = true})
+```
 
 
 <p align="right">(<a href="#readme-top">back to top</a>)</p>
diff --git a/doc/wf.txt b/doc/wf.txt
index f2becb1..8d8b5e6 100644
--- a/doc/wf.txt
+++ b/doc/wf.txt
@@ -79,7 +79,7 @@ Fields~
 {border} `(string)`
 of window border. This can either be a string or an array.
 nvim_open_win
-{borderchars} `(table)` @field top center bottom 
+{borderchars} `(table)` @field top center bottom
 array will specifify the eight chars building up the border in a clockwise fashion starting with the top-left corner.
 nvim_open_win
 {icons} `(table)` @field separator fuzzy_prompt which_prompt
@@ -94,6 +94,8 @@ Fields~
 {selector} "which"|"fuzzy"
 {text_insert_in_advance} `(string)`
 {key_group_dict} `(table)`
+Usage~
+key_group_dict = { "<leader>l"="vimtex", "<leader>e"="conjure" }
 {prefix_size} `(number)`
 {sorter} `(function)`
 {behavior} WFBehavior
@@ -107,6 +109,8 @@ Fields~
                       `bookmark`({bookmark_dirs}, {opts})
 Parameters~
 {bookmark_dirs} `(table)`
+Usage~
+bookmark({nvim="~/.config/nvim", zsh="~/.zshrc"})
 {opts} `(optional)` WFOptions
 
 
diff --git a/lua/wf/builtin/bookmark.lua b/lua/wf/builtin/bookmark.lua
index 68121e2..aec761e 100644
--- a/lua/wf/builtin/bookmark.lua
+++ b/lua/wf/builtin/bookmark.lua
@@ -9,6 +9,7 @@ local ok, devicon = pcall(require_deviocon)
 
 ---@tag builtin.bookmark
 ---@param bookmark_dirs table
+---@usage bookmark({nvim="~/.config/nvim", zsh="~/.zshrc"})
 ---@param opts? WFOptions
 local function bookmark(bookmark_dirs, opts)
   local function _bookmark()
diff --git a/lua/wf/types.lua b/lua/wf/types.lua
index 1eebe36..22c9421 100644
--- a/lua/wf/types.lua
+++ b/lua/wf/types.lua
@@ -46,7 +46,7 @@
 ---@field border string
 ---Style of window border. This can either be a string or an array.
 ---:h nvim_open_win
----@field borderchars table @field top center bottom 
+---@field borderchars table @field top center bottom
 ---The array will specifify the eight chars building up the border in a clockwise fashion starting with the top-left corner.
 ---:h nvim_open_win
 ---@field icons table @field separator fuzzy_prompt which_prompt
@@ -58,6 +58,7 @@
 ---@field selector "which"|"fuzzy"
 ---@field text_insert_in_advance string
 ---@field key_group_dict table
+---@usage key_group_dict = { "<leader>l"="vimtex", "<leader>e"="conjure" }
 ---@field prefix_size number
 ---@field sorter function
 ---@field behavior WFBehavior