made stuff actually work
diff --git a/aos/common/sensors/sensors.h b/aos/common/sensors/sensors.h
index 007921c..a6b2bfa 100644
--- a/aos/common/sensors/sensors.h
+++ b/aos/common/sensors/sensors.h
@@ -44,6 +44,7 @@
// All of the other 4-byte chunks in the message bitwise-exclusive-ORed
// together. Needed because it seems like nobody else checks... (vxworks not
// sending the UDP checksum or (not very likely) linux not checking it).
+ // TODO(brians): static_assert that this is at the front
uint32_t checksum;
Values values;