+{\it book\_file} or {\it book\_url} may be either .hhp file or ZIP archive
+that contains arbitrary number of .hhp files in
+top-level directory. This ZIP archive must have .zip or .htb extension
+(the latter stands for "HTML book"). In other words,
+{\tt AddBook(wxFileName("help.zip"))}
+is possible and, in fact, recommended way.
+
+\wxheading{Parameters}
+
+\docparam{show\_wait\_msg}{If true then a decoration-less window with progress message is displayed.}
+\docparam{book\_file}{Help book filename. It is recommended to use this prototype
+instead of the one taking URL, because it is less error-prone.}
+\docparam{book\_url}{Help book URL (note that syntax of filename and URL is
+different on most platforms)}
+
+\wxheading{Note}
+
+Don't forget to install wxFileSystem ZIP handler with
+{\tt wxFileSystem::AddHandler(new wxZipFSHandler);} before calling this method
+on a .zip or .htb file!
+
+\membersection{wxHtmlHelpController::CreateHelpFrame}\label{wxhtmlhelpcontrollercreatehelpframe}
+
+\func{virtual wxHtmlHelpFrame*}{CreateHelpFrame}{\param{wxHtmlHelpData * }{data}}
+
+This protected virtual method may be overridden so that the controller
+uses slightly different frame. See {\it samples/html/helpview} sample for
+an example.