Update README.md

README.md

@@ -15,13 +15,13 @@ benchmark suite to test the compiler infrastructure.
 [HPVM-C Language Specification](/hpvm/docs/hpvm-c.md)
 
 ## Dependencies
-You would need to download and install the following components for to use HPVM.
+The following components are required to be installed on your machine to build HPVM.
 
 * GCC (>=5.1.0)
 * CMake (>=3.4.3)
 * Python (>=2.7)
 * GNU Make (>=3.79.1)
-* CUDA 9.1
+* CUDA 9.1 (only required for GPU support)
 
 ## Getting source code and building HPVM