--- a/src/Doc/JEdit/JEdit.thy Fri Nov 22 21:57:50 2013 +0100
+++ b/src/Doc/JEdit/JEdit.thy Sat Nov 23 12:59:12 2013 +0100
@@ -227,7 +227,8 @@
theme is selected in a Swing-friendly way.\footnote{GTK support in
Java/Swing was once marketed aggressively by Sun, but never quite
finished, and is today (2013) lagging a bit behind further
- development of Swing and GTK.}
+ development of Swing and GTK. The graphics rendering performance
+ can be worse than for other Swing look-and-feels.}
\item[Windows] Regular \emph{Windows} is used by default, but
\emph{Windows Classic} also works.