diff --git a/index.xml b/index.xml
index 436253364..b240d4e0d 100644
--- a/index.xml
+++ b/index.xml
@@ -44,7 +44,7 @@
 <!ENTITY c1-introduction SYSTEM "intel/chapter1/introduction.xml">
 <!ENTITY c1-how SYSTEM "intel/chapter1/how.xml">
 <!ENTITY c1-version SYSTEM "intel/chapter1/versions.xml">
-<!ENTITY c1-acknowledgements SYSTEM "intel/chapter1/acknowledgements.xml">
+<!ENTITY c1-acknowledgments SYSTEM "intel/chapter1/acknowledgments.xml">
 <!ENTITY c1-changelog SYSTEM "intel/chapter1/changelog.xml">
 <!ENTITY c1-maillists SYSTEM "intel/chapter1/maillists.xml">
 <!ENTITY c1-ma-lfsdiscuss SYSTEM "intel/chapter1/lfsdiscuss.xml">
@@ -188,7 +188,7 @@
 <!ENTITY c5-proc SYSTEM "intel/chapter5/proc.xml">
 
 <!ENTITY chapter6 SYSTEM "intel/chapter6/chapter6.xml">
-<!ENTITY c6troduction SYSTEM "intel/chapter6/introduction.xml">
+<!ENTITY c6-introduction SYSTEM "intel/chapter6/introduction.xml">
 <!ENTITY c6-aboutdebug SYSTEM "intel/chapter6/aboutdebug.xml">
 <!ENTITY c6-bashprofile SYSTEM "intel/chapter6/bashprofile.xml">
 <!ENTITY c6-chroot SYSTEM "intel/chapter6/chroot.xml">