diff --git a/config.yaml b/config.yaml
index a0d7420..3288823 100644
--- a/config.yaml
+++ b/config.yaml
@@ -64,6 +64,7 @@ contact: 'cms-dpoa-coordinator@cern.ch' # FIXME
 # Order of episodes in your lesson
 episodes: 
 - 01-statinference.md
+- 04-combine.md
 - 05-challenge.md
 
 # Information for Learners