diff --git a/docs/latex/wx/radiobox.tex b/docs/latex/wx/radiobox.tex
index c322e79329..31db278c1d 100644
--- a/docs/latex/wx/radiobox.tex
+++ b/docs/latex/wx/radiobox.tex
@@ -345,6 +345,9 @@ a wxEVT\_COMMAND\_RADIOBOX\_SELECTED event to get emitted.
 
 Sets the tooltip text for the specified item in the radio group.
 
+{\bf Platform note:} Currently only implemented in wxMSW and wxGTK2 and does
+nothing in the other ports.
+
 \wxheading{Parameters}
 
 \docparam{item}{Index of the item the tooltip will be shown for.}