diff --git a/core/envsetup.mk b/core/envsetup.mk
index 1c3a1b3..3271079 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -255,6 +255,7 @@
 HOST_PREBUILT_ARCH := x86
 # This is the standard way to name a directory containing prebuilt host
 # objects. E.g., prebuilt/$(HOST_PREBUILT_TAG)/cc
+# This must match the logic in get_host_prebuilt_prefix in envsetup.sh
 HOST_PREBUILT_TAG := $(BUILD_OS)-$(HOST_PREBUILT_ARCH)
 
 # TARGET_COPY_OUT_* are all relative to the staging directory, ie PRODUCT_OUT.