add a tip on unknown command module

docs/source/building/platforms/maxwell_desy.rst

@@ -57,6 +57,16 @@ The ``-npernode`` must be set to ``GPUS_PER_NODE``, otherwise not all GPUs are u
 There are nodes with 4 GPUs and 1 GPU (see the `Maxwell documentation on compute infrastructure <https://confluence.desy.de/display/MXW/Compute+Infrastructure>`__.
 for more details and the required constraints). Please set the value accordingly.
 
+.. tip::
+   If you encounter an error like ``module: command not found``, this can be fixed in most cases by adding the following piece of code before ``module purge`` in your ``profile.hipace`` file.
+
+   .. code-block:: bash
+
+      module ()
+      {
+          eval `modulecmd bash $*`
+      }
+
 .. tip::
    Parallel simulations can be largely accelerated by using GPU-aware MPI.
    To utilize GPU-aware MPI, the input parameter ``hipace.comms_buffer_on_gpu = 1`` must be set and the following flag must be passed in the job script: