--- a/details/adding_channels.rst	Fri Mar 30 18:15:23 2012 +0200
+++ b/details/adding_channels.rst	Fri Mar 30 18:15:44 2012 +0200
@@ -1,2 +1,10 @@
 Adding channels
 ===============
+
+
+
+.. _signal-types:
+
+Signal types
+~~~~~~~~~~~~
+(explain here all the signal type abreviations).