Update README.md

Clarified focus

README.md

@@ -25,7 +25,7 @@
 
 ### Introduction
 
-The Open Grants Program seeks to allocate resources to projects that are beneficial to the advancement of the Polkadot ecosystem. It tries to achieve this in the following way:
+The Open Grants Program focuses on funding software development and research efforts related to **Polkadot, Kusama and Substrate**. It tries to achieve this in the following way:
 - Fully transparent
 - Simple
 - Effective