A small pathogen plugin problem

When I install vim-instant-markdown with pathogen. I find it can not be installed.

It is so interesting.

Look at this blog.

I have thought it is because the path is not correct so I mv the after/plugin directory into the root path of vim-instant-markdown. However, I cannot open the preview when I open a file with an extent .md;

So I went to the project mainpage and at the FAQ I saw the solution. This is because the plugin only recognize files ending with .markdown, .mdown and README.md. In order to recognize files with .md, I neet to install vim-markdown plugin.

I can write markdown file in vim and preview it in Safari at the same time.

Problem solved!