\list does not accept a comment symbol after it

Write a QDoc document that contains

\list
    //! Comment
    \li Text
\endlist 

Then qdoc reports a warning of the form
 

release-notes.qdoc:14: (qdoc) warning: Unrecognized list style '//'

 and renders "! Comment" as text.

An empty line after \list resolves the problem.