diff --git a/science-of-cleaning.tex b/science-of-cleaning.tex
index abbde48..c7b6e48 100644
--- a/science-of-cleaning.tex
+++ b/science-of-cleaning.tex
@@ -1,10 +1,11 @@
-\documentclass[twoside, openany]{book}
+\documentclass[9pt, twoside, openany]{extbook}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %% Packages %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \usepackage[utf8]{inputenc}
 \usepackage[T1]{fontenc}
 \usepackage{float}
+\usepackage{extsizes}
 \raggedbottom
 
 
@@ -207,6 +208,8 @@ If you want to donate financial support for the creation of this zine (and all t
 \setcounter{chapter}{-1}
 \chapter{Introduction}
 
+
+
 \chapter{A pH Primer}
 
 \Chapter{Acid Cleaners}{Vinegar is your friend}
@@ -215,9 +218,11 @@ If you want to donate financial support for the creation of this zine (and all t
 
 \Chapter{Surfactants}{i.e., Soaps and detergents}
 
-\chapter{Abrasive Cleaners}
+\Chapter{Abrasive Cleaners}{Scrub-a-dub-dub}
 
+\chapter{Heat}
 
+\chapter{Enzymes}
 
 
 \end{document}