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diff --git a/lib/libc/sys/ptrace.2 b/lib/libc/sys/ptrace.2
--- a/lib/libc/sys/ptrace.2
+++ b/lib/libc/sys/ptrace.2
@@ -150,31 +150,37 @@
The following controls are provided for this:
.Bl -tag -width security.bsd.unprivileged_proc_debug
.It Dv security.bsd.allow_ptrace
-Setting this sysctl to zero value makes
+Setting this sysctl to zero makes
.Nm
return
.Er ENOSYS
always as if the syscall is not implemented by the kernel.
.It Dv security.bsd.unprivileged_proc_debug
-Setting this sysctl to zero disallows use of
+Setting this sysctl to zero disallows the use of
.Fn ptrace
by unprivileged processes.
.It Dv security.bsd.see_other_uids
-Setting this sysctl to zero value disallows
+Setting this sysctl to zero prevents
.Fn ptrace
-requests from targeting processes with the real user identifier different
-from the real user identifier of the caller.
-The requests return
-.Er ESRCH
-if policy is not met.
+requests from targeting processes with a real user identifier different
+from the caller's.
+These requests will fail with error
+.Er ESRCH .
.It Dv security.bsd.see_other_gids
-Setting this sysctl to zero value disallows
+Setting this sysctl to zero disallows
.Fn ptrace
-requests from process belonging to a group that is not also one of
-the group of the target process.
-The requests return
-.Er ESRCH
-if policy is not met.
+requests from processes that have no groups in common with the target process,
+considering their sets of real and supplementary groups.
+These requests will fail with error
+.Er ESRCH .
+.It Dv security.bsd.see_jail_proc
+Setting this sysctl to zero disallows
+.Fn ptrace
+requests from processes belonging to a different jail than that of the target
+process, even if the requesting process' jail is an ancestor of the target
+process'.
+These requests will fail with error
+.Er ESRCH .
.It Dv securelevel and init
The
.Xr init 1

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