-(the latter stands for "HTML book"). In other words, {\tt AddBook("help.zip")} is possible and, in fact,
-recommended way.
+(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}