diff --git a/_class-notes/about-the-course.md b/_class-notes/about-the-course.md
index 27f8fa3..f32dcdb 100644
--- a/_class-notes/about-the-course.md
+++ b/_class-notes/about-the-course.md
@@ -23,7 +23,7 @@ After this meeting students should:
 - Fellow of the sustainable software institute
 - Maintainer of a number of open source scientific research packages
 
-There are slide for this [here]{{site.baseurl}}/assets/about/main.key).
+There are slide for this [here]({{site.baseurl}}/assets/about/main.key).
 
 ### Programming