diff --git a/devel/lua-resty-string/Makefile b/devel/lua-resty-string/Makefile
index 91da86cefb97..6997c4724197 100644
--- a/devel/lua-resty-string/Makefile
+++ b/devel/lua-resty-string/Makefile
@@ -1,27 +1,38 @@
 PORTNAME=	lua-resty-string
 DISTVERSIONPREFIX=v
 DISTVERSION=	0.15
+PORTREVISION=	1
 CATEGORIES=	devel www
 
 MAINTAINER=	mm@FreeBSD.org
 COMMENT=	String utilities and common hash functions for ngx_lua and LuaJIT
 
 LICENSE=	BSD2CLAUSE
 
 RUN_DEPENDS=	luajit-openresty>=2.1:lang/luajit-openresty
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	openresty
 
 NO_ARCH=	yes
 NO_BUILD=	yes
 
 LUA_MODSHAREDIR=${LOCALBASE}/share/lua/5.1
 
 PLIST_SUB=	LUA_MODSHAREDIR=${LUA_MODSHAREDIR}
 
+PORTDOCS=	README.markdown
+
+DOCSDIR=	${PREFIX}/share/doc/lua${LUA_VER_STR}/${PORTNAME}
+
+OPTIONS_DEFINE=	DOCS
+
 do-install:
 	@${MKDIR} ${STAGEDIR}${LUA_MODSHAREDIR}
 	@(cd ${WRKSRC}/lib && ${COPYTREE_SHARE} . ${STAGEDIR}${LUA_MODSHAREDIR} "-name *\.lua")
 
+do-install-DOCS-on:
+	@${MKDIR} ${STAGEDIR}${DOCSDIR}
+	${INSTALL_DATA} ${WRKSRC}/README.markdown ${STAGEDIR}${DOCSDIR}
+
 .include <bsd.port.mk>