diff --git a/internal-dev/sio-ext.owl b/internal-dev/sio-ext.owl
index 57be7283..5603af43 100644
--- a/internal-dev/sio-ext.owl
+++ b/internal-dev/sio-ext.owl
@@ -61,7 +61,7 @@
         <rdfs:label xml:lang="en">organ type</rdfs:label>
     </owl:Class>
 
-    <! -- http://purl.enanomapper.net/onto/ENM_1850054 -->
+    <!-- http://purl.enanomapper.net/onto/ENM_1850054 -->
 
     <owl:Class rdf:about="http://purl.enanomapper.net/onto/ENM_1850054">
         <rdfs:subClassOf rdf:resource="http://semanticscience.org/resource/SIO_000476"/>