diff --git a/03-oop-in-java-ii/lab/README.md b/03-oop-in-java-ii/lab/README.md
index f164330d..2f27cb70 100644
--- a/03-oop-in-java-ii/lab/README.md
+++ b/03-oop-in-java-ii/lab/README.md
@@ -244,6 +244,7 @@ src
     ├─ plan/
     │  └─ SemesterPlan.java
     ├─ semester/
+	  │  ├─ AbstractSemesterPlanner.java
     │  ├─ ComputerScienceSemesterPlanner.java
     │  ├─ SemesterPlannerAPI.java
     │  └─ SoftwareEngineeringSemesterPlanner.java