TXT records in reverse domains

[Cherney John-CJC030]

Is there any issue with putting TXT records in reverse domains? I want
to put some TXT records in the same domain as some of my PTR records to
give additional information on the hosts in that domain. I've looked in
the DNS & BIND book and online, but I didn't see any explicit statements
that disallow it. However, I didn't see any explicit statements that
allow it, either. All of the examples for TXT records I have seen have
been on the forward domains. 
 
Thanks!
jwc