diff --git a/source/ch05-discovery/main.ptx b/source/ch05-discovery/main.ptx
index 1942271..94183cf 100644
--- a/source/ch05-discovery/main.ptx
+++ b/source/ch05-discovery/main.ptx
@@ -1,10 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 <chapter xml:id="ch-chapter-discovery" xmlns:xi="http://www.w3.org/2001/XInclude">
-  <title>Discovering New Mah</title>
+  <title>Discovering New Mathematics</title>
 
   <introduction>
-    <p> Text before the first section. </p>
+    <p> This is a test </p>
   </introduction>
 
   <xi:include href="./sec01-biggestprime.ptx" />
diff --git a/source/main.ptx b/source/main.ptx
index d69fe92..1a9b6fb 100644
--- a/source/main.ptx
+++ b/source/main.ptx
@@ -5,8 +5,8 @@
   <xi:include href="./docinfo.ptx" />
 
   <book xml:id="wdmd">
-    <title>What Do Mathematicians Do?</title>
-    <subtitle>An Overview of Undergraduate Mathematics</subtitle>
+    <title>What Do Mathematicians and Data Scientists Do?</title>
+    <subtitle>cool stuff</subtitle>
 
     <!-- Include frontmatter -->
     <xi:include href="./frontmatter.ptx" />