diff --git a/book.asciidoc b/book.asciidoc
index 8ca86b47..36d7f442 100644
--- a/book.asciidoc
+++ b/book.asciidoc
@@ -4,6 +4,4 @@
 
 include::preface.asciidoc[]
 
-include::colo.asciidoc[]
-
 include::Introduction.asciidoc[]
\ No newline at end of file