Update login command on README

README.md

@@ -28,7 +28,7 @@ You'll need these things to build the project:
 
 To set up your environment, cd to the project and run `meson build` to create a build directory in `build`. Then cd to the build directory and run `ninja`.
 
-To set up a self-contained Alpine linux filesystem, download the Alpine minirootfs tarball for i386 from the [Alpine website](https://alpinelinux.org/downloads/) and run the `tools/fakefsify.py` script. Specify the minirootfs tarball as the first argument and the name of the output directory as the second argument. Then you can run things inside the Alpine filesystem with `./ish -f alpine /bin/login`, assuming the output directory is called `alpine`.
+To set up a self-contained Alpine linux filesystem, download the Alpine minirootfs tarball for i386 from the [Alpine website](https://alpinelinux.org/downloads/) and run the `tools/fakefsify.py` script. Specify the minirootfs tarball as the first argument and the name of the output directory as the second argument. Then you can run things inside the Alpine filesystem with `./ish -f alpine /bin/login -f root`, assuming the output directory is called `alpine`.
 
 You can replace `ish` with `tools/ptraceomatic` to run the program in a real process and single step and compare the registers at each step. I use it for debugging. Requires 64-bit Linux 4.11 or later.