Document INCLUDE_METAL_SOURCES for standalone target

Signed-off-by: Nathaniel Graff <nathaniel.graff@sifive.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 19347b8..20a4a5d 100644
--- a/Makefile
+++ b/Makefile
@@ -98,7 +98,8 @@ help:
 	@echo "    Launch OpenOCD and attach GDB to the running program."
 	@echo ""
 	@echo " standalone BSP=metal STANDALONE_DEST=/path/to/desired/location"
-	@echo "            [PROGRAM=$(PROGRAM) TARGET=$(TARGET)]:"
+	@echo "            [INCLUDE_METAL_SOURCES=1] [PROGRAM=$(PROGRAM)]"
+	@echo "            [TARGET=$(TARGET)]:"
 	@echo "    Export a program for a single target into a standalone"
 	@echo "    project directory at STANDALONE_DEST."
 	@echo ""