diff --git a/en_US.ISO8859-1/articles/releng/Makefile b/en_US.ISO8859-1/articles/releng/Makefile
index 8a85f8624d..d6ff452ac2 100644
--- a/en_US.ISO8859-1/articles/releng/Makefile
+++ b/en_US.ISO8859-1/articles/releng/Makefile
@@ -1,21 +1,23 @@
 # 
 # $FreeBSD$
 #
 # Article: FreeBSD Release Engineering
 
 DOC?= article
 
 FORMATS?= html
 
 INSTALL_COMPRESSED?= gz
 INSTALL_ONLY_COMPRESSED?=
 
 # SGML content
 SRCS=  article.sgml branches.ascii
 
 # IMAGES
 IMAGES= branches.pic
 
+CSS_SHEET_ADDITIONS= extra.css
+
 DOC_PREFIX?= ${.CURDIR}/../../..
 
 .include "${DOC_PREFIX}/share/mk/doc.project.mk"