diff --git a/index.adoc b/index.adoc
index 70ee7f5..c277cac 100644
--- a/index.adoc
+++ b/index.adoc
@@ -121,11 +121,23 @@ print "hello world!\n";
 .Main Interface
 image::./main1.png[Main Interface]
 
-=== Main Interface
+=== Main Lab Intance Interface
 
 .Lab Instance Interface
 image::./main3.png[Lab Instance Interface]
 
+- **a**  Run your project in  particular Lab
+- **b**  Terminal provides full support for system shells (bash, tsch, etc.). You can run anything in your system shell, including languages such as php, perl, python etc. The terminal runs on the Lab Instance with sudo rights.
+- **c**  Opens a collaborative text editor. The text editor includes syntax highlighting, key maps and basic theming. It can also be used as a terminal with **console output**.  It includes a basic **chat** room enviroment.   
+- **d** Link to invite users. The "Invite users" function is not available yet, you will have to e-mail it by your self! :-) 
+ 
+
+[NOTE]
+====
+
+b, c, d choises  only appear after you click on a Lab Instance
+
+====
 
 
 == Terms