Update README.md

README.md

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 # clas12-env
 [![Build Status](https://github.com/jeffersonlab/clas12-env/workflows/clas12-env-ci/badge.svg)](https://github.com/jeffersonlab/clas12-env/actions)
 
-This is just a [modulefile](https://modules.sourceforge.net/)-based environment setup for CLAS12 software.  Its main branch is deployed on CVMFS to support running CLAS12 software at JLab, on the Open Science Grid, or on any supported operating system with CVMFS access.
+This is just a [modulefile](https://modules.sourceforge.net/)-based environment setup for CLAS12 software, primarily for using CLAS12 software at JLab and on the Open Science Grid, or on any supported operating system with CVMFS access.
 
 Note:
 - The modulefiles and software builds for GEANT4 used in this environment are [documented separately](https://jeffersonlab.github.io/g4home) and can be used independently.