Update README.md

Author: atomic7777

README.md

@@ -34,15 +34,17 @@ If you have any suggestions about design or functionality, please let me know, o
 ![Preview](https://user-images.githubusercontent.com/11677097/53302875-b6205200-3863-11e9-8ab2-5ec95b0799d0.png)
 
 ## 1. Installation
-1. Download `atomic-calendar.js` file to `/www` directory in your Home Assistant - [latest release](https://github.com/atomic7777/atomic_calendar/releases/download/v0.7.1/atomic-calendar.js) - link not working (in development)
-2. Add this reference to your `ui-lovelace.yaml` file:
+1. You need to have the ![Google calendar](https://www.home-assistant.io/components/calendar.google/) component configured in Home Assistant.
+2. Download `atomic-calendar.js` file to `/www` directory in your Home Assistant - [latest release](https://github.com/atomic7777/atomic_calendar/releases/download/v0.7.1/atomic-calendar.js) - link not working (in development)
+3. Add this reference to your `ui-lovelace.yaml` file:
   ```yaml
   resources:
     - url: /local/atomic-calendar.js
       type: module
   ```
-3. Add card with options to `ui-lovelace.yaml`, examples below
-4. If you are upgrading, try to reload your browser cache by pressing ctrl-shift-r or shift-F5.
+4. Add card with options to `ui-lovelace.yaml`, examples below
+5. If you are upgrading, try to reload your browser cache by pressing ctrl-shift-r or shift-F5.
+6. If you want to use `Calendar mode` follow the guide in chapter 6, because HA is getting only 5 nearest events from Google Calendar.
 
 ## 2. Options
 ### Main settings