如何使用markdown文件作为rdoc的主文件（在rails项目中）？

Is it possible to use a readme.md file with a Rails project and have rdoc use it a the main page? I tried setting up my rake task as follows, but the index.html page that gets generated has a placeholder sentence. If I change to README.rdoc it works as expected as includes the file's contents.Is it possible to use a readme.md file with a R