This file is indexed.

/etc/rc1.d/README is in sysv-rc 2.88dsf-59.3ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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The scripts in this directory are executed each time the system enters
this runlevel.

The scripts are all symbolic links whose targets are located in
/etc/init.d/ .

Generally it is not necessary to alter the scripts in this directory.
Their purpose is to stop all services and thus to put the system in
single-user mode.

For more information see /etc/init.d/README.