diff --git a/sandbox/index.mdwn b/sandbox/index.mdwn
index 625295eac..ba7073837 100644
--- a/sandbox/index.mdwn
+++ b/sandbox/index.mdwn
@@ -41,6 +41,8 @@ Examples:
 
 ---
 
+## Thesaurus representation
+
 - <[[Zthes - The Zthes specifications for thesaurus representation, access and navigation|http://zthes.z3950.org/]]>
 - <http://www.loc.gov/z3950/agency/profiles/>
 - [[SKOS Simple Knowledge Organization System - home page|https://www.w3.org/2004/02/skos/]]