TBR: Add comment to makefile explaining variables.
Change-Id: I00db553122774bcaac0693c7b9ce831e037692aa
diff --git a/mojo.mk b/mojo.mk
index 56fac19..821f911 100644
--- a/mojo.mk
+++ b/mojo.mk
@@ -23,6 +23,7 @@
# Add Dart SDK to path.
PATH := $(shell jiri v23-profile env --profiles=dart DART_SDK=)/bin:$(PATH)
+# Set variables from environment based on profile and target.
MOJO_DEVTOOLS := $(shell jiri v23-profile env --profiles=$(MOJO_PROFILE) --target=$(TARGET) MOJO_DEVTOOLS=)
MOJO_SDK := $(shell jiri v23-profile env --profiles=$(MOJO_PROFILE) --target=$(TARGET) MOJO_SDK=)
MOJO_SERVICES := $(shell jiri v23-profile env --profiles=$(MOJO_PROFILE) --target=$(TARGET) MOJO_SERVICES=)