diff --git a/usr.sbin/apm/apm.8 b/usr.sbin/apm/apm.8
index 733589b11fa5..9c8afb1e3a69 100644
--- a/usr.sbin/apm/apm.8
+++ b/usr.sbin/apm/apm.8
@@ -83,7 +83,7 @@ These options are not necessary for almost all APM implementations,
 but for some implementations whose
 .Dq Pa Idle CPU
 call executes both CPU clock slowdown and HLT instruction,
-.Fl t
+.Fl h Ar false
 is necessary to prevent the system from reducing its peak performance.
 See
 .Xr apm 4