diff --git a/Vim-mode.md b/Vim-mode.md
index 78a00ef..78b0b07 100644
--- a/Vim-mode.md
+++ b/Vim-mode.md
@@ -5,6 +5,8 @@ You can use Vim keymap.
 
 ![image](https://user-images.githubusercontent.com/11307908/31042494-8656dc28-a5e4-11e7-9eb9-17fbcc5a084a.png)
 
+Don't forget to restart Boostnote.
+
 # Specifications
 ## :q to escape from Edit mode
 `:q`, `:qw`, `:wq` and `:q!` are available to escape from Edit mode.
@@ -13,5 +15,15 @@ You can use Vim keymap.
 
 ref: https://github.com/BoostIO/Boostnote/pull/885
 
+## Custom keymaps
+You can customize your keymaps, but it's not actually supported. If you want to map `jj` as `Esc`, run the script below on the developer console.
+
+```js
+CodeMirror.Vim.map('jj', '<Esc>', 'insert')
+```
+
+![image](https://user-images.githubusercontent.com/11307908/31042550-b8555adc-a5e5-11e7-9c42-6485eab82b5f.png)
+
+
 # note
 There's no way to share yank and clipboard for now.
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