Adding comment.

src/sorcha_community_utils/activity/lsst_comet/lsst_comet_activity.py

@@ -72,6 +72,8 @@ def compute(
         # this calculates the coma magnitude in each filter
         try:
             for filt in observing_filters:
+                # here rap is the aperture width, hardcoded here to 1.0 arcsec
+                # the code assumes an infinite coma so is thus only accurate for small apertures
                 df.loc[df["optFilter"] == filt, "coma_magnitude"] = com.mag(g, filt, rap=1.0)
         except KeyError as err:
             self._log_exception(err)