Added note about NANOS_TARGET_ROOT variable
@@ -60,6 +60,8 @@ Create a Chroot:
mkdir target-root && cd target-root && wget
https://storage.googleapis.com/testmisc/target-root.tar.gz && tar xzf target-root.tar.gz
```
+You should also set the environment variable NANOS_TARGET_ROOT to the path of
+target-root created above in order to create the example and test images.
#### To build:
```
