diff --git a/packages/slate-mark-hotkeys/Readme.md b/packages/slate-mark-hotkeys/Readme.md
index fc4af4d..a536fad 100644
--- a/packages/slate-mark-hotkeys/Readme.md
+++ b/packages/slate-mark-hotkeys/Readme.md
@@ -21,6 +21,26 @@ const plugins = [
 />
 ```
 
+If you call `MarkHotKeys()` without any parameters, the following marks are set up by default:
+
+Hotkey | Rendered Tag
+--- | ---
+`b` | `<strong>`
+`i` | `<em>`
+`u` | `<u>`
+``` ` ``` | `<code>`
+`~` | `<del>`
+
+You may overwrite the default options by passing additional options as an object.
+
+```js
+const plugins = [
+  MarkHotkeys({
+    optionKey: optionValue
+  })
+]
+```
+
 Option | Type | Description
 --- | --- | ---
 **`keysToMarks`** | `Object` | An optional object whose keys are hotkey descriptors and whose respective values are the marks to be applied when the hotkey is triggered. Keys without a `+` in them are automatically prepended with `mod+`, but those with an `+` are not modified. They are all passed to `isHotkey`, which has its own [API](https://www.npmjs.com/package/is-hotkey) for defining hotkeys. Defaults to a map containing marks for bold, underline, italics, strikethrough, and code.