diff --git a/dot_config/nvim/Readme.md b/dot_config/nvim/Readme.md
index 5c78c4b..271d124 100644
--- a/dot_config/nvim/Readme.md
+++ b/dot_config/nvim/Readme.md
@@ -15,6 +15,7 @@ Yuan Neovim 備忘
     * move cursor: <window>(方向鍵)
 
 ### 擴充自行設定的快速鍵
+* `<F6>` 可以回朔到開啟檔案以來的任何歷史，還會標出修改的地方
 * `<F8>`: NeoTree: 查看已經開啟的檔案
 * `<F9>`: NeoTree
 * `<F10>`: git status
@@ -22,7 +23,6 @@ Yuan Neovim 備忘
 * `<leader>fB`: 已開啟的檔案
 
 #### 預計設定
-* <F6> 可以回朔到開啟檔案以來的任何歷史，還會標出修改的地方
 * <F7> 看看你設定了哪些變數、函數，也可以快速跳轉
 
 ### 編輯習慣（已經覆寫）
diff --git a/dot_config/nvim/exact_lua/exact_plugins/exact_components/undo.lua b/dot_config/nvim/exact_lua/exact_plugins/exact_components/undo.lua
new file mode 100644
index 0000000..658cf7c
--- /dev/null
+++ b/dot_config/nvim/exact_lua/exact_plugins/exact_components/undo.lua
@@ -0,0 +1,30 @@
+return {
+  {
+    "jiaoshijie/undotree",
+    dependencies = "nvim-lua/plenary.nvim",
+    config = true,
+    keys = { -- load the plugin only when using it's keybinding:
+      { "<F6>", "<cmd>lua require('undotree').toggle()<cr>" },
+      { "<leader>u", "<cmd>lua require('undotree').toggle()<cr>" },
+    },
+    opts = {
+      float_diff = true,  -- using float window previews diff, set this `true` will disable layout option
+      layout = "left_bottom", -- "left_bottom", "left_left_bottom"
+      position = "right", -- "left", "right", "bottom"
+      ignore_filetype = { 'undotree', 'undotreeDiff', 'qf', 'TelescopePrompt', 'spectre_panel', 'tsplayground' },
+      window = {
+        winblend = 30,
+      },
+      keymaps = {
+        ['j'] = "move_next",
+        ['k'] = "move_prev",
+        ['gj'] = "move2parent",
+        ['J'] = "move_change_next",
+        ['K'] = "move_change_prev",
+        ['<cr>'] = "action_enter",
+        ['p'] = "enter_diffbuf",
+        ['q'] = "quit",
+      },
+    },
+  }
+}