diff --git a/sys/kern/subr_kdb.c b/sys/kern/subr_kdb.c
index e7b9a730ee7..6b2be996ed6 100644
--- a/sys/kern/subr_kdb.c
+++ b/sys/kern/subr_kdb.c
@@ -89,7 +89,7 @@ SYSCTL_PROC(_debug_kdb, OID_AUTO, trap, CTLTYPE_INT | CTLFLAG_RW, 0, 0,
 #ifdef SMP
 static int kdb_stop_cpus = 1;
 SYSCTL_INT(_debug_kdb, OID_AUTO, stop_cpus, CTLTYPE_INT | CTLFLAG_RW,
-    &kdb_stop_cpus, 0, "");
+    &kdb_stop_cpus, 0, "stop other CPUs when entering the debugger");
 TUNABLE_INT("debug.kdb.stop_cpus", &kdb_stop_cpus);
 #endif