diff --git a/share/man/man4/smp.4 b/share/man/man4/smp.4
index a1b8c09f3133..b2c73c2b50ae 100644
--- a/share/man/man4/smp.4
+++ b/share/man/man4/smp.4
@@ -23,7 +23,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd May 7, 2008
+.Dd January 6, 2017
 .Dt SMP 4
 .Os
 .Sh NAME
@@ -57,6 +57,11 @@ The
 .Xr mptable 1
 command may be used to view the status of multi-processor support.
 .Pp
+.Nm
+support can be disabled by setting the loader tunable
+.Va kern.smp.disabled
+to 1.
+.Pp
 The number of CPUs detected by the system is available in
 the read-only sysctl variable
 .Va hw.ncpu .