diff --git a/usr.sbin/pmcstat/pmcstat.c b/usr.sbin/pmcstat/pmcstat.c
--- a/usr.sbin/pmcstat/pmcstat.c
+++ b/usr.sbin/pmcstat/pmcstat.c
@@ -983,7 +983,7 @@
 	if ((args.pa_required & FLAG_HAS_PROCESS_PMCS) &&
 	    (args.pa_flags & FLAG_HAS_PROCESS_PMCS) == 0)
 		errx(EX_USAGE,
-"ERROR: options -d, -E, and -W require a process mode PMC to be specified."
+"ERROR: options -d, -E, -t, and -W require a process mode PMC to be specified."
 		    );
 
 	/* check for -c cpu with no system mode PMCs or logfile. */