diff --git a/doc/BookChapters/chapter1.do.txt b/doc/BookChapters/chapter1.do.txt
index 285e4d191..3e95088cd 100644
--- a/doc/BookChapters/chapter1.do.txt
+++ b/doc/BookChapters/chapter1.do.txt
@@ -9,7 +9,7 @@
 
 
 
-Our emphasis throughout this series of lectures  
+Our emphasis throughout this series of lectures (small change)  
 is on understanding the mathematical aspects of
 different algorithms used in the fields of data analysis and machine learning.