diff --git a/README.md b/README.md
index 9374db0..04f1156 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ The official RPI course catalog is well-known for being a garbage fire.
 Just about every piece of information that it gives for a course can be inaccurate.
 
 Oftentimes, the prerequisites are wrong, the times that the course is offered is wrong ("Spring annually"/etc),
-and worst of all many courses still listed in the catalog haven't been offered in years and effectively no longer exist (e.g. [CHEM-4330](catalog.rpi.edu/preview_course.php?catoid=24&coid=51428) hasn't been offered since 2013).
+and worst of all many courses still listed in the catalog haven't been offered in years and effectively no longer exist (e.g. [CHEM-4330](https://catalog.rpi.edu/preview_course.php?catoid=24&coid=51428) hasn't been offered since 2013).
 
 The Quatalog aims to make course planning easier by providing accurate prerequiste data and data for when a
 given course was offered in the past, as well as data for how many students were enrolled in the course,