Update README.md

README.md

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 Flip is an advanced and beautiful flip counter plugin. Easy to use and highly flexible, you can set up a custom counter on your website in minutes. Display visitor counts, countdown to a special date or celebrate progress. Whatever you’re planning, the options are endless.
 
-[Learn more on the product site](https://pqina.nl/flip/)
+[Learn more about Flip on the product site](https://pqina.nl/flip/)
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+[Learn more about Tick, the engine powering Flip](https://github.com/pqina/tick/)
 
 Made with ❤ By [Rik Schennink](https://twitter.com/rikschennink/)
 
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 Information on how to customize Tick and use the Tick API can be found on the [product website](https://pqina.nl/tick/).
 
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 ## License
 
 MIT License, Enjoy!