diff --git a/src/main/resources/pato.iris b/src/main/resources/pato.iris
index 7102133..859162e 100644
--- a/src/main/resources/pato.iris
+++ b/src/main/resources/pato.iris
@@ -7,3 +7,4 @@
 +D(http://purl.obolibrary.org/obo/BFO_0000019):http://purl.obolibrary.org/obo/PATO_0000161 rate
 +D(http://purl.obolibrary.org/obo/BFO_0000019):http://purl.obolibrary.org/obo/PATO_0001536 solubility
 +D(http://purl.obolibrary.org/obo/BFO_0000019):http://purl.obolibrary.org/obo/PATO_0000117 size
++(http://purl.obolibrary.org/obo/BFO_0000019):http://purl.obolibrary.org/obo/PATO_0000068 qualitative
\ No newline at end of file