add pointer to configure scripts

README.rst

@@ -63,6 +63,17 @@ To install, for example, the ``foss2022a-serial`` toolchain:
          foss2022a-serial
          [module use /home/user/mpsd-software/dev-23a/cascadelake/lmod/Core]
 
+5. To compile Octopus, source the provided configure script, for example ``foss2022a-serial-config.sh``, as
+   `explained here <https://computational-science.mpsd.mpg.de/docs/mpsd-hpc.html#loading-a-toolchain-to-compile-octopus>`__).
+   The configure scripts are located in ``dev-23a/spack-environments/octopus``::
+
+     $ ls -1 dev-23a/spack-environments/octopus
+
+     foss2021a-cuda-mpi-config.sh
+     foss2021a-mpi-config.sh
+     foss2021a-serial-config.sh
+     foss2022a-cuda-mpi-config.sh
+     foss2022a-mpi-config.sh
 
 
 Documentation