diff --git a/yaml/xyz/openbmc_project/Inventory/Item/Chassis.interface.yaml b/yaml/xyz/openbmc_project/Inventory/Item/Chassis.interface.yaml
index df2dc09..e946f80 100644
--- a/yaml/xyz/openbmc_project/Inventory/Item/Chassis.interface.yaml
+++ b/yaml/xyz/openbmc_project/Inventory/Item/Chassis.interface.yaml
@@ -3,6 +3,40 @@
 
 properties:
     - name: Type
-      type: string
+      type: enum[self.ChassisType]
+      default: Unknown
       description: >
           The type of physical form factor of the chassis.
+
+enumerations:
+    - name: ChassisType
+      description: >
+          Possible chassis type
+      values:
+        - name: Component
+          description: >
+              A small chassis, card, or device that contains devices for a
+              particular subsystem or function.
+        - name: Enclosure
+          description: >
+              A generic term for a chassis that does not fit any other
+              description.
+        - name: Module
+          description: >
+              A small, typically removable, chassis or card that contains
+              devices for a particular subsystem or function.
+        - name: RackMount
+          description: >
+              A single-system chassis designed specifically for mounting in an
+              equipment rack.
+        - name: StandAlone
+          description: >
+              A single, free-standing system, commonly called a tower or
+              desktop chassis.
+        - name: Unknown
+          description: >
+              An unknown chassis type.
+        - name: Zone
+          description: >
+              A logical division or portion of a physical chassis that contains
+              multiple devices or systems that cannot be physically separated.