diff --git a/documents/by-course/pstat-120a/course-notes/main.typ b/documents/by-course/pstat-120a/course-notes/main.typ
index 2ce63b2..efcd39c 100644
--- a/documents/by-course/pstat-120a/course-notes/main.typ
+++ b/documents/by-course/pstat-120a/course-notes/main.typ
@@ -31,7 +31,7 @@ upon them.
 ]
 
 #definition[
-  A *Set* is a collection of elements.
+  A *set* is a collection of elements.
 ]
 
 #example[Examples of sets][