For installed versions of perl that support them, look in perlop with perldoc perlop and you will find this in there. (you will find that the docs on-site are not from Perl 5.6): 
PERLOP(1)      User Contributed Perl Documentation      PERLOP(1)


               Options:

                   c   Complement the SEARCHLIST.
                   d   Delete found but unreplaced characters.
                   s   Squash duplicate replaced characters.
                   U   Translate to/from UTF-8.
                   C   Translate to/from 8-bit char (octet).

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In reply to Re: extra options in tr/// by extremely
in thread extra options in tr/// by Anonymous Monk

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