Are comments possible in mapping.csv

I've configured a pilot installation using LDAP for authentication, but the flat file mapping.csv for authorization/role assignment (This is a pilot and having my IT team setup LDAP groups for authorization is just too much overhead for now).

This configuration is working well, but with a lot of users I would like to be able to put commetns in the mapping.csv file. Something like:

# R&D Team
rdleaduser,JazzUser
rdotheruser,JazzUser
rdadminuser,

# PV Team
pvleaduser,JazzUser
pvadminuser,


Is something like that supported?

Thanks

Jay