diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index a7b0526c064a..23b4a6d8b66b 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -115,6 +115,10 @@ int	bootverbose = BOOTVERBOSE;
 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
 	"Control the output of verbose kernel messages");
 
+#ifdef INVARIANTS
+FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance");
+#endif
+
 /*
  * This ensures that there is at least one entry so that the sysinit_set
  * symbol is not undefined.  A sybsystem ID of SI_SUB_DUMMY is never