Update README

README.md

@@ -92,7 +92,8 @@ This can include installing packages, creating configuration files and starting
 
 The `down.nu` scripts contain the steps to revert the change applied by a task. These scripts will
 later be used to offer functionalities like reinstalling grub or changing installed kernels.
- 
+
+A script can declare a global variable `let run_in_chroot = true` to be executed inside the new root. 
 
 # License