Fix comments.

wrappers/python/simtk/openmm/app/charmmparameterset.py

@@ -471,8 +471,8 @@ class CharmmParameterSet(object):
                 except IndexError:
                     raise CharmmFileError('Could not parse NBFIX terms.')
                 self.nbfix_types[(min(at1, at2), max(at1, at2))] = (emin, rmin)
-        # Now we're done. Load the nonbonded types into the relevant AtomType
-        # instances. In order for this to work, all keys in nonbonded_types
+        # If there were any CMAP terms stored in the parameter set, the last one
+        # defined will not have been added to the set. Add it now.
         if current_cmap is not None:
             ty = CmapType(current_cmap_res, current_cmap_data)
             self.cmap_types[current_cmap] = ty