diff --git a/share/man/man4/mac_priority.4 b/share/man/man4/mac_priority.4
--- a/share/man/man4/mac_priority.4
+++ b/share/man/man4/mac_priority.4
@@ -21,7 +21,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd December 7, 2021
+.Dd December 14, 2021
 .Dt MAC_PRIORITY 4
 .Os
 .Sh NAME
@@ -79,13 +79,16 @@
 .Xr rtprio 2
 system calls.
 .Ss Privileges Granted
-The kernel privileges granted to any process running
-with the corresponding group gid is:
-.Bl -tag -width ".Dv PRIV_SCHED_RTPRIO" -offset indent
+The realtime policy grants the following kernel privileges to any process
+running with the realtime group id:
+.Bl -inset -offset indent -compact
 .It Dv PRIV_SCHED_RTPRIO
-If it is a member of the realtime group.
+.It Dv PRIV_SCHED_SETPOLICY
+.El
+.Pp
+The kernel privilege granted by the idletime policy is:
+.Bl -inset -offset indent -compact
 .It Dv PRIV_SCHED_IDPRIO
-If it is a member of the idletime group.
 .El
 .Ss Runtime Configuration
 The following
diff --git a/sys/security/mac_priority/mac_priority.c b/sys/security/mac_priority/mac_priority.c
--- a/sys/security/mac_priority/mac_priority.c
+++ b/sys/security/mac_priority/mac_priority.c
@@ -64,8 +64,8 @@
 static int
 priority_priv_grant(struct ucred *cred, int priv)
 {
-	if (priv == PRIV_SCHED_RTPRIO && realtime_enabled &&
-	    groupmember(realtime_gid, cred))
+	if ((priv == PRIV_SCHED_RTPRIO || priv == PRIV_SCHED_SETPOLICY) &&
+	    realtime_enabled && groupmember(realtime_gid, cred))
 		return (0);
 
 	if (priv == PRIV_SCHED_IDPRIO && idletime_enabled &&