[texdoc] texdoc problem

[Karl Berry]

    cayley[~/Jfh] % texdoc texdoc
    Sorry, no documentation found for texdoc.

Are documentation files installed? Otherwise, I can't explain it.
I get:

$ texdoc -l texdoc
 1 /usr/local/texlive/2017/texmf-dist/doc/texdoc/texdoc.pdf
 2 /usr/local/texlive/2017/texmf-dist/doc/texdoc/News
 3 /usr/local/texlive/2017/texmf-dist/doc/man/man1/texdoc.man1.pdf
Please enter the number of the file to view, anything else to skip: