diff --git a/Makefile.inc1 b/Makefile.inc1
index 1b58c0f00685..f6d215baf149 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -1618,6 +1618,8 @@ ${_bt}-usr.bin/m4: ${_bt}-lib/libopenbsd
 ${_bt}-usr.bin/lex: ${_bt}-usr.bin/m4
 .endif
 
+# r245440 mtree -N support added
+# r313404 requires sha384.h for libnetbsd, added to libmd in r292782
 .if ${BOOTSTRAPPING} < 1100093
 _nmtree=	lib/libmd \
 		lib/libnetbsd \