diff --git a/README.md b/README.md
index 3cf9c73..823c911 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@ Make sure the following programs are in your `PATH`:
 arcasHLA requires the following Python modules:
 - [Biopython](https://biopython.org/wiki/Download)
 - NumPy
+- SciPy
 - Pandas
 
 ### Test ###