diff --git a/web/demos b/web/demos
index 3865cf037..db24bebd7 100644
--- a/web/demos
+++ b/web/demos
@@ -83,3 +83,7 @@ click on the name of the output file:
 @   pandoc @@math.text@@ -s --gladtex -o mathGladtex.htex
 @   gladtex @@mathGladtex.htex@@   # produces @@mathGladtex.html@@
 
+18. Syntax highlighting of delimited code blocks:
+
+@   pandoc @@code.txt@@ -s -o @@example18.html@@
+