diff --git a/manuscript/02_probability.md b/manuscript/02_probability.md
index 6426788..a346857 100644
--- a/manuscript/02_probability.md
+++ b/manuscript/02_probability.md
@@ -16,8 +16,8 @@ a level to have a basic understanding for the rest of the series. For a more
 complete treatment see the class Mathematical Biostatistics Boot Camp 1, which
 can be viewed on YouTube [here](Youtube:
 www.youtube.com/playlist?list=PLpl-gQkQivXhk6qSyiNj51qamjAtZISJ-).  In addition,
-there's  the actual [Coursera course](Coursera:
-www.coursera.org/course/biostats) that I run periodically (this is the first
+there's  the actual [Coursera course](https://www.coursera.org/course/biostats)
+that I run periodically (this is the first
 Coursera class that I ever taught).  Also there are a set of [notes on
 GitHub](http://github.com/bcaffo/Caffo-Coursera). Finally, there's a follow up
 class, uninspiringly named  Mathematical Biostatistics Boot Camp 2, that is more