diff --git a/kerberos5/lib/libasn1/Makefile b/kerberos5/lib/libasn1/Makefile
index 911868331f9b..177de85c1ed5 100644
--- a/kerberos5/lib/libasn1/Makefile
+++ b/kerberos5/lib/libasn1/Makefile
@@ -116,6 +116,9 @@ ${GEN_KX509}: kx509.asn1
 .hx.h:
 	${CP} ${.IMPSRC} ${.TARGET}
 
+# This makefile generates a lot of its headers
+# so tell bsd.sys.mk not to try and stage them before they are built.
+# Note: this is rare
 NO_BEFOREBUILD_INCLUDES=
 
 .include <bsd.lib.mk>