diff --git a/examples/preferential-optimization/generator.py b/examples/preferential-optimization/generator.py
index 659505f5..5b9aab43 100644
--- a/examples/preferential-optimization/generator.py
+++ b/examples/preferential-optimization/generator.py
@@ -68,7 +68,7 @@ def main() -> NoReturn:
             )
             save_note(trial, note)
 
-            # 4. Mark comparison ready
+            # 5. Mark comparison ready
             study.mark_comparison_ready(trial)