Updated README.md

README.md

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 **OpenGYS** is an fully open source real estate management system. **OpenGYS**, allow the landlords to manage their real estates. So, the landlords can add rent contract, track rent payments, track monthly rental income and real estate distribution by category via dashboard.
 
-[Frontend project](https://github.com/burakpadr/opengys-backend)
+[Frontend project](https://github.com/burakpadr/opengys-frontend)
 
 # Prerequisite