diff --git a/sbin/sysctl/sysctl.8 b/sbin/sysctl/sysctl.8
index b87061c4226f..942fd7cdadef 100644
--- a/sbin/sysctl/sysctl.8
+++ b/sbin/sysctl/sysctl.8
@@ -214,6 +214,7 @@ denote
 .It "hw.pagesize	integer	no
 .It "hw.floatingpoint	integer	no
 .It "hw.machine_arch	string	no
+.It "hw.realmem	integer	no
 .It "machdep.console_device	dev_t	no
 .It "machdep.adjkerntz	integer	yes
 .It "machdep.disable_rtc_set	integer	yes