diff --git a/README.md b/README.md
index 23b9672..e596d32 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,7 @@ Links to individual lectures will be posted below. We will be using [Galaxy Trai
 - [Lecture 12](https://training.galaxyproject.org/topics/data-science/tutorials/gnmx-lecture7/tutorial.html) - Git/GitHub 1 - Git logic
 - Lecture 13 - How to create your own web-site using GitHub and Markdown + [Project discussion](https://www.science.org/doi/10.1126/science.aag0822) 
 - Lecture 14 - How Illumina works + [Introduction to Galaxy](https://gxy.io/GTN:T00186)
-- Lecture 15 - QCing and [mapping short reads](https://github.com/nekrut/BMMB554/blob/master/2024/finding_matches.md)
+- Lecture 15 - [QCing](https://training.galaxyproject.org/training-material/topics/introduction/tutorials/vsi_qc/tutorial.html) and [mapping short reads](https://github.com/nekrut/BMMB554/blob/master/2024/finding_matches.md)
 - Lecture 16 - How Pacific Biosciences (PacBio) works + Galaxy workflow system
 - Lecture 17 - Introduction to Galaxy
 - Lecture 18 - Assembly I --- *k*-mers and graphs