diff --git a/labs/04_memory_debugging/README.md b/labs/04_memory_debugging/README.md
index db5e298..e770cfa 100644
--- a/labs/04_memory_debugging/README.md
+++ b/labs/04_memory_debugging/README.md
@@ -115,3 +115,7 @@ Mismatched free() / delete / delete []
 ```
 
 **To receive credit for this checkpoint**, discuss your answers to these questions with a TA or mentor.
+
+## Checkpoint 4
+
+Checkpoint 4 will be available at the start of Wednesday’s lab.