I'm running with FSF19.25
>From the info page... 150
`i'
(`bbdb-info') This jumps from the `*BBDB*' buffer to this
documentation. If this documentation is installed in the standard
place (the directory named by the variable `Info-directory') in a
file called `bbdb' or `bbdb.info', then no further configuration is
necessary to make this work.
What about Info-directory-list?
It strikes me as being rather strange that Info-directory would ever
only been one path.
For the moment I'll have to set the bbdb-info-file var instead.