diff --git a/bambi_playground.py b/bambi_playground.py
index 3c6161f..94bd464 100644
--- a/bambi_playground.py
+++ b/bambi_playground.py
@@ -11,4 +11,5 @@
 model = Model('a ~ b * c', data)
 model.fit()
 
+# not print the hierarchical model
 model.graph()
\ No newline at end of file