Maven site generate invalid link with markdown

When a markdown page index.md has a relative [my link](target.md), maven site plugin :

• generates index.html and target.html (Good).
• keeps md extension : <a href="target.md"> (Invalid link)

This make the generated site unusable: the correct link should be <a href="target.html">
Notice such links work on GitHub or other online services: it would be useful to have maven-site-plugin aligned