diff --git a/sys/kern/subr_capability.c b/sys/kern/subr_capability.c
index 61ace5ab6e4..1098448d4e5 100644
--- a/sys/kern/subr_capability.c
+++ b/sys/kern/subr_capability.c
@@ -30,6 +30,10 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+/*
+ * Note that this file is compiled into the kernel and into libc.
+ */
+
 #ifdef _KERNEL
 #include <sys/types.h>
 #include <sys/capability.h>