diff --git a/interface/interface.ttl b/interface/interface.ttl
index 534618b942..a412b8e878 100644
--- a/interface/interface.ttl
+++ b/interface/interface.ttl
@@ -159,6 +159,9 @@ pint:House
 pint:House
 	owl:equivalentClass
 	ppr:House .
+pint:House
+	owl:equivalentClass
+	phm:House .
 	
 # Laying
 pint:Laying