Update README.md

Author: abbitude

README.md

@@ -108,7 +108,7 @@ Do you know of an incredible green software repository that we missed? Let us kn
 
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 ### Contributing to GitHub's Green Software Directory
-We are looking for projects that are actively being used/developed and can be used by others.
+We are looking for projects **on GitHub** that are actively being used/developed and can be used by others.
 
 - Create a fork of this project.
 - Create a new branch