--- loncom/html/adm/help/tex/Authoring_RadiobuttonResponse.tex	2007/08/07 22:46:54	1.3
+++ loncom/html/adm/help/tex/Authoring_RadiobuttonResponse.tex	2017/01/23 20:29:42	1.4
@@ -1,7 +1,17 @@
-\label{Authoring_RadiobuttonResponse}
+\label{Authoring_RadiobuttonResponse}\index{radiobuttonresponse}
 
 \textbf{radiobuttonresponse} implements a true/false question with
 one correct answer. It uses the foil structure tags as described in
 \ref{Authoring_Foil_Structure_Tags}, but the \emph{value} of a foil can only
 be \textbf{true}, \textbf{false}, or \textbf{unused}.
+It is possible to use a Perl variable for the value attribute, as long as it can only have a valid value.
 
+Several true foils can be specified, but only one (randomly chosen) will be displayed.
+
+Possible attributes for \texttt{<radiobuttonresponse>} are:
+\begin{itemize}
+  \item \textbf{max}: the maximum number of foils displayed at once
+  (if more are specified, some will not be displayed)
+  \item \textbf{randomize}: set to \texttt{yes} to randomize the order of foils when displayed
+  \item \textbf{direction}: set to \texttt{horizontal} to display foils horizontally
+\end{itemize}