1 files changed, 0 insertions, 1 deletions
diff --git a/index.xml b/index.xml
index 635e2072e..0d9124ccc 100644
--- a/index.xml
+++ b/index.xml
@@ -213,7 +213,6 @@
 <!ENTITY c6-gcc-inst SYSTEM "chapter6/gcc-inst.xml">
 <!ENTITY c6-bison SYSTEM "chapter6/bison.xml">
 <!ENTITY c6-bison-inst SYSTEM "chapter6/bison-inst.xml">
-<!ENTITY c6-bison-exp SYSTEM "chapter6/bison-exp.xml">
 <!ENTITY c6-mawk SYSTEM "chapter6/mawk.xml">
 <!ENTITY c6-mawk-inst SYSTEM "chapter6/mawk-inst.xml">
 <!ENTITY c6-findutils SYSTEM "chapter6/findutils.xml">