diff --git a/en_US.ISO8859-1/articles/freebsd-releng/Makefile b/en_US.ISO8859-1/articles/freebsd-releng/Makefile
index 5f5890060c..fb708adc4e 100644
--- a/en_US.ISO8859-1/articles/freebsd-releng/Makefile
+++ b/en_US.ISO8859-1/articles/freebsd-releng/Makefile
@@ -12,11 +12,14 @@ INSTALL_ONLY_COMPRESSED?=
 
 SRCS=		article.xml
 
+DEPS!= egrep '<!ENTITY release\.[^ ]+ SYSTEM "./releng-[^ ]+\.xml">' \
+	${SRCS} | sed -E 's,.*"./([^"]+)".*,\1,'
+
 CSS_SHEET_ADDITIONS=extra.css
 
 URL_RELPREFIX?=	../../../..
 DOC_PREFIX?=	${.CURDIR}/../../..
 
-all: .PHONY clean
+index.html ${DOC}.html: ${DEPS}
 
 .include "${DOC_PREFIX}/share/mk/doc.project.mk"