#112 Update README.md

README.md

@@ -5,37 +5,47 @@
   See LICENSE in the root of the repository for full licensing details.
 -->
 
-# PSyTran: tools for automating OpenACC GPU porting efforts using PSyclone
+# PSyTran: tools for PSyclone transformation scripting
 
 ## Introduction
 
 Before introducing PSyTran, we should introduce
-[PSyclone](https://github.com/stfc/PSyclone). PSyclone is a domain-specific compiler and
-code transformation tool for earth system codes written in Fortran. In code
-transformation mode (which is of main interest here), PSyclone can be used to read in
-Fortran source code, along with a user-defined *transformation script* (written in
-Python), which describes modifications to be made to the source code. With these two
-ingredients, PSyclone converts the source code to its internal *intermediate
-representation*, applies the transformations, and then writes out the modified code.
-
-One key example of a transformation to be applied to the input code is to insert
-[OpenACC](https://www.openacc.org) directives and clauses. Compiled under
-[NVHPC](https://developer.nvidia.com/hpc-sdk), the OpenACC syntax tells the compiler how
-to parallelise the code on Nvidia GPUs. This is the transformation of primary interest
-as far as PSyTran goes.
-
-PSyTran is a Python package which provides various helper functions for PSyclone,
-particularly with regards to writing transformation scripts for OpenACC GPU porting.
+[PSyclone](https://github.com/stfc/PSyclone). PSyclone is a domain-specific
+compiler and code transformation tool for earth system codes written in Fortran.
+In code transformation mode (which is of main interest here), PSyclone can be
+used to read in Fortran source code, along with a user-defined
+*transformation script* (written in Python), which describes modifications to be
+made to the source code. With these two ingredients, PSyclone converts the
+source code to its internal *intermediate representation*, applies the
+transformations, and then writes out the modified code.
+
+Key examples of transformations to be applied to the input code are to
+insert [OpenMP](https://www.openmp.org) and [OpenACC](https://www.openacc.org)
+directives and clauses, providing instructions to compilers on how to
+distribute work in parallel for CPU or GPU. PSyclone offers the ability to
+inject these compiler directives into source code as a transformation.
+
+The transformations possible with PSyclone aren't limited to inserting compiler
+directives. From chunking loops to inlining routines, PSyclone has an enormous
+selection of transformations, which are all
+[documented here](https://psyclone.readthedocs.io/en/stable/transformations.html).
+
+PSyTran is a Python package which provides various helper functions for using
+PSyclone, most notably for, but not limited to, writing transformation scripts
+for inserting OpenACC and OpenMP directives and clauses.
+
 Amongst other things, PSyTran provides functionality for:
  * simplifying tree traversal in PSyclone's intermediate representation,
- * analysing the structure of loops and loop nests,
+ * finding and analysing the structure of loops and loop nests,
  * applying OpenACC `kernels` and `loop` directives,
  * applying OpenACC clauses to `loop` directives,
+ * applying OpenMP directives,
  * querying `Node` types.
 
 ## General user instructions
 
-Instructions for installing PSyTran and building and viewing its documentation may be found on the [Wiki page](https://github.com/MetOffice/psytran/wiki#general-users).
+Instructions for installing PSyTran and building and viewing its documentation
+may be found on the [Wiki page](https://github.com/MetOffice/psytran/wiki#general-users).
 
 ## Developer notes