diff --git a/xyz/openbmc_project/Association/Definitions.interface.yaml b/xyz/openbmc_project/Association/Definitions.interface.yaml
new file mode 100644
index 0000000..80cdee8
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+++ b/xyz/openbmc_project/Association/Definitions.interface.yaml
@@ -0,0 +1,12 @@
+description: >
+    This interface is used to tell the mapper to create
+    xyz.openbmc_project.Association interfaces on <this path>/forward and
+    endpoint/reverse.
+properties:
+    - name: Associations
+      type: array[struct[string,string,string]]
+      description: >
+          An array of forward, reverse, endpoint tuples where:
+              forward - The type of the association.
+              reverse - The type of the association to create for the endpoint.
+              endpoint - The association endpoint.