Ah, this is interesting.  I think it might be a good idea to have a module-level docstring mentioning what is done when this module is imported, something like:
```
"""@file des_meds.py  Module for generating DES Multi-Epoch Data Structures (MEDS) in GalSim.

This module defines the `MultiExposureObject` class for representing multiple exposure data for a single object, and the `WCSTransform` class used to store general, locally-linearized WCS information per exposure.  The `write_meds` function
can be used to write a list of `MultiExposureObject` instances to a single MEDS file.

Importing this module with `import des.des_meds` also adds these data structures to the config framework, so that MEDS
file output can subsequently be simulated directly using a config file.
```