Index: head/Mk/Uses/bison.mk
===================================================================
--- head/Mk/Uses/bison.mk	(revision 528180)
+++ head/Mk/Uses/bison.mk	(revision 528181)
@@ -1,35 +1,40 @@
 # $FreeBSD$
 #
 # handle dependency on the bison port
 #
 # Feature:	bison
 # Usage:	USES=bison or USES=bison:ARGS
-# Valid ARGS:	build (default, implicit), run, both
+# Valid ARGS:	build (default, implicit), run, both, alias, wrappers
+#
+# 'alias'	will automatically create a BINARY_ALIAS to use base
+#		byacc invoked as bison
+# 'wrapper'	will automatically create BINARY_WRAPPER to use base
+#		byacc with a wrapper to mimic a bit more bison
 #
 # MAINTAINER: portmgr@FreeBSD.org
 
 .if !defined(_INCLUDE_USES_BISON_MK)
 _INCLUDE_USES_BISON_MK=	yes
 
 _BISON_DEPENDS=	bison:devel/bison
 
 .if empty(bison_ARGS)
 bison_ARGS=	build
 .endif
 
 .if ${bison_ARGS} == "build"
 BUILD_DEPENDS+=	${_BISON_DEPENDS}
 .elif ${bison_ARGS} == "run"
 RUN_DEPENDS+=	${_BISON_DEPENDS}
 .elif ${bison_ARGS} == "both"
 BUILD_DEPENDS+=	${_BISON_DEPENDS}
 RUN_DEPENDS+=	${_BISON_DEPENDS}
 .elif ${bison_ARGS} == "alias"
 BINARY_ALIAS+=	bison=byacc
 .elif ${bison_ARGS} == "wrapper"
 BINARY_WRAPPERS+=	bison
 .else
 IGNORE=	USES=bison - invalid args: [${bison_ARGS}] specified
 .endif
 
 .endif