Theres also "man -k <whateveryouwanttoknowabout>"
For instance:
man -k message
Returns:
catclose [catopen] (3) - open/close a message catalog
catgets (3) - get message from a message catalog
catopen (3) - open/close a message catalog
closelog [syslog] (3) - send messages to the system logger
encrypt (3) - Encrypt 64 bits messages
err (3) - formatted error messages
errx [err] (3) - formatted error messages
issue (5) - pre-login message and identification file
klogctl [syslog] (2) - read and/or clear kernel message ring buffer; set console_loglevel
motd (5) - message of the day
msgctl (2) - message control operations
msgget (2) - get a message queue identifier
msgop (2) - message operations
openlog [syslog] (3) - send messages to the system logger
perror (3) - print a system error message
printk (9) - print messages to console log
psignal (3) - print signal message
recv (2) - receive a message from a socket
recvfrom [recv] (2) - receive a message from a socket
recvmsg [recv] (2) - receive a message from a socket
rtnetlink (3) - Macros to manipuate rtnetlink messages
send (2) - send a message from a socket
sendmsg [send] (2) - send a message from a socket
sendto [send] (2) - send a message from a socket
syslog (2) - read and/or clear kernel message ring buffer; set console_loglevel
syslog (3) - send messages to the system logger
verr [err] (3) - formatted error messages
verrx [err] (3) - formatted error messages
vwarn [err] (3) - formatted error messages
vwarnx, [err] (3) - formatted error messages
warn [err] (3) - formatted error messages
warnx [err] (3) - formatted error messages
However "man -k subliminal" does not return the man page for xsublim.
Conspiracy(YES)? You decide