diff --git a/lib/galaxy/config/sample/datatypes_conf.xml.sample b/lib/galaxy/config/sample/datatypes_conf.xml.sample
index 88c6883c61c..8ac23cb2a1b 100644
--- a/lib/galaxy/config/sample/datatypes_conf.xml.sample
+++ b/lib/galaxy/config/sample/datatypes_conf.xml.sample
@@ -597,8 +597,10 @@
     <datatype extension="bed_tabix.gz" type="galaxy.datatypes.interval:BedTabix" mimetype="application/octet-stream" display_in_upload="true"/>
     <datatype extension="gff_tabix.gz" type="galaxy.datatypes.interval:GffTabix" mimetype="application/octet-stream" display_in_upload="true"/>
     <datatype extension="bgzip" type="galaxy.datatypes.binary:CompressedArchive" subclass="true" display_in_upload="true"/>
+    <!-- GWAS results datatypes to be used with locuszoom visualization plugin -->
     <datatype extension="gwas_bgzip" type="galaxy.datatypes.binary:CompressedArchive" subclass="true" display_in_upload="true"/>
     <datatype extension="gwas_tabix.gz" type="galaxy.datatypes.binary:CompressedArchive" subclass="true" display_in_upload="true"/>
+    <!-- -->
     <datatype extension="vcf_bgzip" type="galaxy.datatypes.tabular:VcfGz" display_in_upload="true">
       <display file="igv/vcf.xml"/>
       <converter file="vcf_bgzip_to_tabix_converter.xml" target_datatype="tabix"/>