Puppet strings markdown output error

puppetstrings_output_markdown.md

I'm using the following versions of yard and puppet strings:

$ puppet resource package yard provider=puppet_gem
package { 'yard':
  ensure => ['0.9.12'],
}

$ puppet resource package puppet-strings provider=puppet_gem
package { 'puppet-strings':
  ensure => ['1.1.1'],
}

Using the syntax documented in de the README I get the following error:

$ puppet strings generate --format markdown
Error: Could not parse application options: invalid option: --format

So I checked the options (puppet strings generate --help) and it seems --format has been replaced with --render-as. But when I try to render the documentation I get an error that it does not support markdown.

$ puppet strings generate --render-as markdown
Error: Could not parse application options: I don't know how to render 'markdown'

So is markdown output no longer supported or am I doing something wrong?

bundle exec puppet strings generate --format markdown ./lib/puppet/**/*.rb worked for me.