diff --git a/doc/posix.texi b/doc/posix.texi
index a823bc360..4d4473422 100644
--- a/doc/posix.texi
+++ b/doc/posix.texi
@@ -10,7 +10,7 @@
 * Time::                        gettimeofday, localtime, strftime, etc.
 * Runtime Environment::         Accessing and modifying Guile's environment.
 * Processes::                   getuid, getpid, etc.
-* Signals::                     sigaction, kill, pause, alarm, etc.
+* Signals::                     sigaction, kill, pause, alarm, setitimer, etc.
 * Terminals and Ptys::          ttyname, tcsetpgrp, etc.
 * Pipes::                       Communicating data between processes.
 * Networking::                  gethostbyaddr, getnetent, socket, bind, listen.
@@ -1456,6 +1456,30 @@ Sleep for I microseconds.  @code{usleep} is not available on
 all platforms.
 @end deffn
 
+@deffn primitive setitimer which_timer interval_seconds interval_microseconds value_seconds value_microseconds
+
+Set the timer specified by @var{which_timer} according to the given
+@var{interval_seconds}, @var{interval_microseconds},
+@var{value_seconds}, and @var{value_microseconds} values, and return
+information about the timer's previous setting. The timers available
+are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL}, and @code{ITIMER_PROF},
+and the return value will be a list of two cons pairs representing the
+current state of the given timer.  The first pair is the seconds and
+microseconds of the timer @code{it_interval}, and the second pair is the
+seconds and microseconds of the timer @code{it_value}.
+@end deffn
+
+@deffn primitive getitimer which_timer
+Return information about the timer specified by @var{which_timer}.  The
+timers available are: @code{ITIMER_REAL}, @code{ITIMER_VIRTUAL}, and
+@code{ITIMER_PROF}, and the return value will be a list of two cons
+pairs representing the current state of the given timer.  The first pair
+is the seconds and microseconds of the timer @code{it_interval}, and the
+second pair is the seconds and microseconds of the timer
+@code{it_value}.
+@end deffn
+
+
 @node Terminals and Ptys
 @section Terminals and Ptys