diff --git a/config/ncit.iris b/config/ncit.iris
index 74584447..2c6e46be 100644
--- a/config/ncit.iris
+++ b/config/ncit.iris
@@ -51,3 +51,4 @@
 +(http://livercancer.imbi.uni-heidelberg.de/ccont#CCONT_0000047):http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl#C44374 Diesel Exhaust Particulate
 +(http://purl.obolibrary.org/obo/BFO_0000015):http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl#C157206 Adsorption
 +(http://purl.obolibrary.org/obo/UO_0000054):http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl#C67311 Microgram per Square Centimeter
++(http://purl.obolibrary.org/obo/UO_0000307):http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl#C66976 Miligram per Kilogram per Day