diff --git a/README.md b/README.md
index c059a0c..a3a0b21 100644
--- a/README.md
+++ b/README.md
@@ -53,15 +53,16 @@ Mathsteroids can be configured by setting values in a file called `config.json`
 (see [`config.json.template`](config.json.template)). The following entries can be set
 in the configuration JSON:
 
-| Entry                 | Allowed values                            | Default            | Description |
-| --------------------- | ----------------------------------------- | ------------------ | ----------- |
-| `"high-scores"`       | `true`, `false`                           | `false`            | Toggles high score tables |
-| `"controller"`        | `"none"`, `"playstation"`, `"mega-drive"` | `"none"`           | Allows input from a controller to be used |
-| `"game-mode"`         | `"lives"`, `"time"`                       | `"lives"`          | Set the game mode. If `"lives"`, player start with 3 lives and games end when lives run out. If `"time", games will last 30 seconds, with negative points given for losing a "life" |
-| `"pre-html"`          | Any string                                | `""`               | HTML to place above the game |
-| `"centered"`          | `true`, `false`                           | `false`            | Toggles centering of content |
-| `"show-webad"`        | `true`, `false`                           | `false`            | Toggles advert below game saying you can play it onling|
-| `"show-instructions"` | `true`, `false`                           | `true`             | Toggles instructions that can be displayed beloe the game |
-| `"debug"`             | `true`, `false`                           | `false`            | Toggles the visibility of debug information |
-| `"sound"`             | `true`, `false`                           | `false`            | Toggles sound |
-| `"sound-dir"`         | Any string                                | `"sounds/default"` | Sets the directory where the sound files are located |
+| Entry                    | Allowed values       | Default            | Description |
+| ------------------------ | -------------------- | ------------------ | ----------- |
+| `"high-scores"`          | `true`, `false`      | `false`            | Toggles high score tables |
+| `"controller"`           | `"none"`, `"playstation"`, `"mega-drive"`, `"emf"` | `"none"`           | Allows input from a controller to be used |
+| `"game-mode"`            | `"lives"`, `"time"`  | `"lives"`          | Set the game mode. If `"lives"`, player start with 3 lives and games end when lives run out. If `"time", games will last 30 seconds, with negative points given for losing a "life" |
+| `"pre-html"`             | Any string           | `""`               | HTML to place above the game |
+| `"centered"`             | `true`, `false`      | `false`            | Toggles centering of content |
+| `"show-webad"`           | `true`, `false`      | `false`            | Toggles advert below game saying you can play it onling|
+| `"show-instructions"`    | `true`, `false`      | `true`             | Toggles instructions that can be displayed below the game |
+| `"show-control-buttons"` | `true`, `false`      | `true`             | Toggles control buttons shown below the game |
+| `"debug"`                | `true`, `false`      | `false`            | Toggles the visibility of debug information |
+| `"sound"`                | `true`, `false`      | `false`            | Toggles sound |
+| `"sound-dir"`            | Any string           | `"sounds/default"` | Sets the directory where the sound files are located |