diff --git a/TODO.txt b/TODO.txt
index 198786fb..a8925764 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -1,4 +1,5 @@
 - [INTERFACE] make a nice GUI for linkchecker
   + QT GUI
+    http://www.diotavelli.net/PyQtWiki/Threading,_Signals_and_Slots
   + add debian .menu file
   + test on Windows