README.md in fusuma-plugin-sendkey-0.4.0 vs README.md in fusuma-plugin-sendkey-0.5.0

@@ -1,20 +1,21 @@
 # Fusuma::Plugin::Sendkey [![Gem Version](https://badge.fury.io/rb/fusuma-plugin-sendkey.svg)](https://badge.fury.io/rb/fusuma-plugin-sendkey) [![Build Status](https://travis-ci.com/iberianpig/fusuma-plugin-sendkey.svg?branch=master)](https://travis-ci.com/iberianpig/fusuma-plugin-sendkey)
 
 [Fusuma](https://github.com/iberianpig/fusuma) plugin to send keyboard events
 
-* Emulate keyboard events with evdev
-* This plugin is wayland compatible and alternative to xdotool
+* Low-latency key event emulation with evdev
+* Alternative to xdotool available for X11 and Wayland
 
 ## Installation
 
 Run the following code in your terminal.
 
 ### Install dependencies
 
+**NOTE: If you have installed ruby by apt, you must install ruby-dev.**
 ```sh
-$ sudo apt-get install libevdev-dev
+$ sudo apt-get install libevdev-dev ruby-dev
 ```
 
 ### Install fusuma-plugin-sendkey
 
 ```sh
@@ -25,23 +26,33 @@
 ## List available keys
 
 ```sh
 $ fusuma-sendkey -l
 ```
+If you want to look up a specific key, like the next song or the previous song, the `grep -i` refinement search is useful.
 
+```sh
+$ fusuma-sendkey -l | grep -i song
+NEXTSONG
+PREVIOUSSONG
+```
+
 ## Run fusuma-sendkey on Terminal
 
 * `fusuma-sendkey` command is available on your terminal
-* `fusuma-sendkey` can send multiple key events
-* Combine keys for pressing the same time with `+` 
+* `fusuma-sendkey` supports modifier keys and multiple key presses.
+Combine keys for pressing the same time with `+` 
 
 
 ```sh
 $ fusuma-sendkey LEFTCTRL+T # press ctrl key + t key
 ```
 
+Some of the keys found with `fusuma-sendkey -l` may actually be invalid keys.
+So test it once with `fusuma-sendkey <KEYCODE>` and then add it to config.yml.
 
+
 ## Add sendkey properties to config.yml
 
 Add `sendkey:` property in `~/.config/fusuma/config.yml`.
 
 lines beginning from `#` are comments
@@ -55,9 +66,29 @@
       sendkey: "LEFTALT+LEFT" # history forward
     up:
       sendkey: "LEFTCTRL+T" # open new tab
     down:
       sendkey: "LEFTCTRL+W" # close tab
+```
+
+
+### Specify keyboard by device name
+
+If you got following error message, try to set your keyboard name to `plugin.executors.sendkey_executor.device_name` on config.yml
+
+```shell
+$ fusuma-sendkey -l
+sendkey: Keyboard: /keyboard|Keyboard|KEYBOARD/ is not found
+```
+
+Set the following options to recognize keyboard only for the specified keyboard device.
+Open `~/.config/fusuma/config.yml` and add the following code at the bottom.
+
+```yaml
+plugin:
+  executors:
+    sendkey_executor:
+      device_name: 'YOUR KEYBOARD NAME'
 ```
 
 ## Contributing
 
 Bug reports and pull requests are welcome on GitHub at https://github.com/iberianpig/fusuma-plugin-sendkey. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.