diff --git a/.gitignore b/.gitignore
index 41520d3..44fbd87 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 book
+*.pdf
+*.fo
 *~
diff --git a/chapters/yourown.xml b/chapters/yourown.xml
index b02054a..8f0cddd 100644
--- a/chapters/yourown.xml
+++ b/chapters/yourown.xml
@@ -2,7 +2,7 @@
 <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook V5.0//EN"
     "http://docbook.org/xml/5.0/dtd/docbook.dtd">
 
-<chapter id="extending" 
+<chapter id="yourown" 
     xmlns="http://docbook.org/ns/docbook" version="5.0" xml:lang="en"
     xmlns:xi="http://www.w3.org/2001/XInclude">