diff --git a/nearby/README.md b/nearby/README.md
index 2731b3e..0d26563 100644
--- a/nearby/README.md
+++ b/nearby/README.md
@@ -49,6 +49,7 @@
 ```sh
 Build unbundled module using banchan
 
+$ source build/envsetup.sh
 $ banchan com.google.android.tethering mainline_modules_arm64
 $ m apps_only dist
 $ adb install out/dist/com.google.android.tethering.apex