diff --git a/unit7.md b/unit7.md
index 0acdcd1..23bbd87 100644
--- a/unit7.md
+++ b/unit7.md
@@ -4,9 +4,9 @@ layout: page
 bibliography:
 - refs.bib
 ---
-
+Material:
+- Unit 7 Practice Problems Contributed by Daniel Hernandez for Extra Credit: [Math_50_Unit_7_Problem_Contributions_for_Extra_Credit___Daniel_Hernandez.pdf](https://github.com/user-attachments/files/23731003/Math_50_Unit_7_Problem_Contributions_for_Extra_Credit___Daniel_Hernandez.pdf)
 # Summary
-
 I will cover additional topics depending on time and iterests. Potential topics include: 
 - Gaussian processes
 - Multi-level models, mixed and fixed effects model