More verbose error reporting in mk/target.mk

diff --git a/mk/target.mk b/mk/target.mk
index f75fae8..e349489 100644 (file)
--- a/mk/target.mk
+++ b/mk/target.mk
@@ -596,7 +596,7 @@ maintainer-clean:: extraclean
 
 ifneq "$(way)" ""
 ifeq "$(findstring $(way), $(WAYS))" ""
-$(error Unknown way $(way))
+$(error Unknown way $(way) of $(WAYS))
 endif
 endif