diff --git a/slides/common/intro.md b/slides/common/intro.md
index f9782e75..0048853f 100644
--- a/slides/common/intro.md
+++ b/slides/common/intro.md
@@ -49,8 +49,21 @@ class: self-paced
 
   http://container.training/
 
-- Typos? Mistakes? Questions? Feel free to hover over the bottom of the slide ...
+<!--
+.exercise[
+```open https://github.com/jpetazzo/container.training```
+```open http://container.training/```
+]
+-->
 
 --
 
+- Typos? Mistakes? Questions? Feel free to hover over the bottom of the slide ...
+
 .footnote[.emoji[👇] Try it! The source file will be shown and you can view it on GitHub and fork and edit it.]
+
+<!--
+.exercise[
+```open https://github.com/jpetazzo/container.training/tree/master/slides/common/intro.md```
+]
+-->