diff --git a/lib/libc/sys/getrlimit.2 b/lib/libc/sys/getrlimit.2
index b28a82ca953..2e79b3000c6 100644
--- a/lib/libc/sys/getrlimit.2
+++ b/lib/libc/sys/getrlimit.2
@@ -120,6 +120,9 @@ sysctl is set.
 Please see
 .Xr tuning 7
 for a complete description of this sysctl.
+.It Dv RLIMIT_UMTXP
+The limit of the number of process-shared posix thread library objects
+allocated by user id.
 .It Dv RLIMIT_VMEM
 An alias for
 .Dv RLIMIT_AS .