--entry=TEXT insert TEXT as an Info directory entry.
TEXT is written as an Info menu item line followed
by zero or more extra lines starting with whitespace.
If you specify more than one entry, all are added.
If you don't specify any entries, they are determined
from information in the Info file itself.
When removing, TEXT specifies the entry to remove.
TEXT is only removed as a last resort, if the
entry as determined from the Info file is not present,
and the basename of the Info file isn't found either.