diff --git a/index.xml b/index.xml
index 4365afa9e..3848886d1 100644
--- a/index.xml
+++ b/index.xml
@@ -70,7 +70,7 @@
 <!ENTITY c3-diffutils SYSTEM "chapter3/diffutils.xml">
 <!ENTITY c3-fileutils SYSTEM "chapter3/fileutils.xml">
 <!ENTITY c3-gcc SYSTEM "chapter3/gcc.xml">
-<!ENTITY c3-gcc-patch SYSTEM "chpater3/gcc-patch.xml">
+<!ENTITY c3-gcc-patch SYSTEM "chapter3/gcc-patch.xml">
 <!ENTITY c3-kernel SYSTEM "chapter3/kernel.xml">
 <!ENTITY c3-grep SYSTEM "chapter3/grep.xml">
 <!ENTITY c3-gzip SYSTEM "chapter3/gzip.xml">
@@ -461,7 +461,6 @@
 <!ENTITY ac-gcc SYSTEM "appendixc/gcc.xml">
 <!ENTITY ac-gcc-patch SYSTEM "appendixc/gcc-patch.xml">
 <!ENTITY ac-kernel SYSTEM "appendixc/kernel.xml">
-<!ENTITY ac-kernel-patch SYSTEM "appendixc/kernel-patch.xml">
 <!ENTITY ac-grep SYSTEM "appendixc/grep.xml">
 <!ENTITY ac-gzip SYSTEM "appendixc/gzip.xml">
 <!ENTITY ac-gzip-patch SYSTEM "appendixc/gzip-patch.xml">