diff --git a/xyz/openbmc_project/ObjectMapper.interface.yaml b/xyz/openbmc_project/ObjectMapper.interface.yaml
index aa0f6e1..c745444 100644
--- a/xyz/openbmc_project/ObjectMapper.interface.yaml
+++ b/xyz/openbmc_project/ObjectMapper.interface.yaml
@@ -13,6 +13,10 @@
           type: s # TODO: o
           description: >
             The object path for which the result should be fetched.
+        - name: interfaces
+          type: as
+          description: >
+            An array of result set constraining interfaces.
       returns:
         - name: services
           type: a{sas}
@@ -28,6 +32,10 @@
           type: s # TODO: o
           description: >
             The path for which the result should be fetched.
+        - name: interfaces
+          type: as
+          description: >
+            An array of result set constraining interfaces.
       returns:
         - name: ancestors
           type: a{sa{sas}} # TODO a{oa{sas}}
@@ -48,6 +56,10 @@
           description: >
             The maximum subtree depth for which results should be fetched.
             For unconstrained fetches use a depth of zero.
+        - name: interfaces
+          type: as
+          description: >
+            An array of result set constraining interfaces.
       returns:
         - name: objects
           type: a{sa{sas}} # TODO a{oa{sas}}
@@ -66,6 +78,10 @@
           description: >
             The maximum subtree depth for which results should be fetched.
             For unconstrained fetches use a depth of zero.
+        - name: interfaces
+          type: as
+          description: >
+            An array of result set constraining interfaces.
       returns:
         - name: paths
           type: as # TODO ao