diff --git a/doc/mp11.adoc b/doc/mp11.adoc
index 748001a..04778d2 100644
--- a/doc/mp11.adoc
+++ b/doc/mp11.adoc
@@ -15,6 +15,8 @@ Peter Dimov
 :listing-caption: Code Example
 :table-caption: Illustration
 :docinfo: private-footer
+:source-highlighter: rouge
+:source-language: c++
 
 :leveloffset: +1