diff --git a/config/bto.iris b/config/bto.iris
index 131e6efb..e4ff37fc 100644
--- a/config/bto.iris
+++ b/config/bto.iris
@@ -8,4 +8,4 @@
 +(http://purl.obolibrary.org/obo/UBERON_0000062):http://purl.obolibrary.org/obo/BTO_0001279 spinal cord
 +(http://purl.obolibrary.org/obo/UBERON_0000062):http://purl.obolibrary.org/obo/BTO_0000269 colon
 +(http://purl.obolibrary.org/obo/UBERON_0000062):http://purl.obolibrary.org/obo/BTO_0000341 diaphragm
-
++(http://purl.obolibrary.org/obo/UBERON_0000062):http://purl.obolibrary.org/obo/BTO_0000224 liver