diff --git a/contrib/elftoolchain/readelf/readelf.c b/contrib/elftoolchain/readelf/readelf.c
index 6db564a32366..c509e591fcba 100644
--- a/contrib/elftoolchain/readelf/readelf.c
+++ b/contrib/elftoolchain/readelf/readelf.c
@@ -1121,6 +1121,7 @@ note_type_freebsd(unsigned int nt)
 	case 1: return "NT_FREEBSD_ABI_TAG";
 	case 2: return "NT_FREEBSD_NOINIT_TAG";
 	case 3: return "NT_FREEBSD_ARCH_TAG";
+	case 4: return "NT_FREEBSD_FEATURE_CTL";
 	default: return (note_type_unknown(nt));
 	}
 }
diff --git a/sys/sys/elf_common.h b/sys/sys/elf_common.h
index 5aa10ad1c802..3a1607815a74 100644
--- a/sys/sys/elf_common.h
+++ b/sys/sys/elf_common.h
@@ -759,6 +759,7 @@ typedef struct {
 #define	NT_FREEBSD_ABI_TAG	1
 #define	NT_FREEBSD_NOINIT_TAG	2
 #define	NT_FREEBSD_ARCH_TAG	3
+#define	NT_FREEBSD_FEATURE_CTL	4
 
 /* Values for n_type.  Used in core files. */
 #define	NT_PRSTATUS	1	/* Process status. */