Add docs for MessageBeep.
diff --git a/Doc/lib/libwinsound.tex b/Doc/lib/libwinsound.tex
index 0418c74..d6518ad 100644
--- a/Doc/lib/libwinsound.tex
+++ b/Doc/lib/libwinsound.tex
@@ -37,6 +37,16 @@
\exception{RuntimeError} is raised.
\end{funcdesc}
+\begin{funcdesc}{MessageBeep}{\optional{type=\code{MB_OK}}}
+ Call the underlying \cfunction{MessageBeep()} function from the
+ Platform API. This plays a sound as specified in the registry. The
+ \var{type} argument specifies which sound to play; possible values
+ are \code{-1}, \code{MB_ICONASTERISK}, \code{MB_ICONEXCLAMATION},
+ \code{MB_ICONHAND}, \code{MB_ICONQUESTION}, and \code{MB_OK}, all
+ described below. The value \code{-1} produces a ``simple beep'';
+ this is the final fallback if a sound cannot be played otherwise.
+ \versionadded{2.3}
+\end{funcdesc}
\begin{datadesc}{SND_FILENAME}
The \var{sound} parameter is the name of a WAV file.
@@ -110,3 +120,23 @@
\begin{datadesc}{SND_NOWAIT}
Return immediately if the sound driver is busy.
\end{datadesc}
+
+\begin{datadesc}{MB_ICONASTERISK}
+ Play the \code{SystemDefault} sound.
+\end{datadesc}
+
+\begin{datadesc}{MB_ICONEXCLAMATION}
+ Play the \code{SystemExclamation} sound.
+\end{datadesc}
+
+\begin{datadesc}{MB_ICONHAND}
+ Play the \code{SystemHand} sound.
+\end{datadesc}
+
+\begin{datadesc}{MB_ICONQUESTION}
+ Play the \code{SystemQuestion} sound.
+\end{datadesc}
+
+\begin{datadesc}{MB_OK}
+ Play the \code{SystemDefault} sound.
+\end{datadesc}