Please add this to readme:

[jitbit]

If you get this error "Unhandled Exception: System.InvalidOperationException: Can only add child notes implementing IWebFormsContentNode" - remove asp.net user controls and "register tagprefix" directive from the aspx page before converting.

[Daniel15]

You can edit it yourself by going to https://github.com/telerik/razor-converter/blob/master/README.md and clicking "Edit", and can then send a pull request to get Telerik to merge your changes into their version :)