-As {\bf wxLogDebug}, only does something in debug
-build. The reason for making it a separate function from it is that usually
-there are a lot of trace messages, so it might make sense to separate them
-from other debug messages which would be flooded in them. Moreover, the second
-version of this function takes a trace mask as the first argument which allows
-to further restrict the amount of messages generated. The value of {\it mask} can be:
+As {\bf wxLogDebug}, trace functions only do something in debug build and
+expand to nothing in the release one. The reason for making
+it a separate function from it is that usually there are a lot of trace
+messages, so it might make sense to separate them from other debug messages.
+
+The trace messages also usually can be separated into different categories and
+the second and third versions of this function only log the message if the
+{\it mask} which it has is currently enabled in \helpref{wxLog}{wxlog}. This
+allows to selectively trace only some operations and not others by changing
+the value of the trace mask (possible during the run-time).
+
+For the second function (taking a string mask), the message is logged only if
+the mask has been previously enabled by the call to
+\helpref{AddTraceMask}{wxlogaddtracemask}. The predefined string trace masks
+used by wxWindows are:
+
+\begin{itemize}\itemsep=0pt
+\item wxTRACE\_MemAlloc: trace memory allocation (new/delete)
+\item wxTRACE\_Messages: trace window messages/X callbacks
+\item wxTRACE\_ResAlloc: trace GDI resource allocation
+\item wxTRACE\_RefCount: trace various ref counting operations
+\item wxTRACE\_OleCalls: trace OLE method calls (Win32 only)
+\end{itemize}
+
+The third version of the function only logs the message if all the bit
+corresponding to the {\it mask} are set in the wxLog trace mask which can be
+set by \helpref{SetTraceMask}{wxlogsettracemask}. This version is less
+flexible than the previous one because it doesn't allow defining the user
+trace masks easily - this is why it is deprecated in favour of using string
+trace masks.