diff --git a/unit6.md b/unit6.md
index c7704d3..f7e2697 100644
--- a/unit6.md
+++ b/unit6.md
@@ -12,6 +12,7 @@ At this point we have seen that models can be too complicated, but thus far **co
 
 Material: 
 - [Notes and exercises](/public/latex_notes/unit6/unit6.pdf)
+- Unit 5 Problem Contributions for Extra Credit- Daniel Hernandez: [Math_50_Unit_6_Problem_Contributions_for_Extra_Credit__Daniel_Hernandez.pdf](https://github.com/user-attachments/files/23730949/Math_50_Unit_6_Problem_Contributions_for_Extra_Credit__Daniel_Hernandez.pdf)
 - [Colab notebook]()
 
 # Concepts
@@ -31,4 +32,4 @@ Regularization for regression models, Priors, Laplace rule of succession, Bayes
 - [Prior probability](https://en.wikipedia.org/wiki/Prior_probability)  
 - [Rule of succession](https://en.wikipedia.org/wiki/Rule_of_succession)  
 - [Ridge regression](https://en.wikipedia.org/wiki/Ridge_regression)  
-- [Lasso (statistics)](https://en.wikipedia.org/wiki/Lasso_(statistics))  
\ No newline at end of file
+- [Lasso (statistics)](https://en.wikipedia.org/wiki/Lasso_(statistics))