D42032.id128076.diff
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	diff --git a/lib/libc/sys/semctl.2 b/lib/libc/sys/semctl.2
	--- a/lib/libc/sys/semctl.2
	+++ b/lib/libc/sys/semctl.2
	@@ -23,7 +23,7 @@
	.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	.\"
	-.Dd July 9, 2020
	+.Dd October 2, 2023
	.Dt SEMCTL 2
	.Os
	.Sh NAME
	@@ -79,6 +79,15 @@
	.Fa "struct semid_ds" ,
	storing it in the memory pointed to by
	.Fa arg.buf .
	+.It Dv SEM_STAT
	+Return a
	+.Fa "semid_ds"
	+structure as for
	+.Dv IPC_STAT .
	+However, for this command we assume
	+.Fa semid
	+is an array index in the kernel's internal array that maintains information
	+about all semaphore sets on the system rather than an id of a semaphore set.
	.It Dv IPC_SET
	Changes the
	.Fa sem_perm.uid ,
	@@ -156,12 +165,19 @@
	.Sh RETURN VALUES
	On success, when
	.Fa cmd
	-is one of
	+is is one of
	.Dv GETVAL , GETPID , GETNCNT
	or
	.Dv GETZCNT ,
	.Fn semctl
	-returns the corresponding value; otherwise, 0 is returned.
	+returns the corresponding value, when
	+.Fa cmd
	+is
	+.Dv SEM_STAT
	+.Fn semctl
	+returns the identifier of the semaphore set whose index was given in
	+.Fa semid ;
	+otherwise, 0 is returned.
	On failure, -1 is returned, and
	.Va errno
	is set to indicate the error.