diff --git a/release/doc/en_US.ISO8859-1/installation/Makefile b/release/doc/en_US.ISO8859-1/installation/Makefile
index d5a02879c46a..54c45d7f36f8 100644
--- a/release/doc/en_US.ISO8859-1/installation/Makefile
+++ b/release/doc/en_US.ISO8859-1/installation/Makefile
@@ -4,6 +4,7 @@ RELN_ROOT?= ${.CURDIR}/../..
 
 SUBDIR = alpha
 SUBDIR+= i386
+SUBDIR+= pc98
 SUBDIR+= sparc64
 
 .include "${RELN_ROOT}/share/mk/doc.relnotes.mk"