diff --git a/cs623/notes.txt b/cs623/notes.txt
index f88eafe..989c112 100644
--- a/cs623/notes.txt
+++ b/cs623/notes.txt
@@ -183,3 +183,7 @@ Chapter 7 - Design Models
   2. Descriptive Models
     help understand user-system
     interaction such as STNs
+
+Chapter 8 - Usability Testing
+
+Chapter 10.1 - Window Design