diff --git a/openapi/task_execution_service.openapi.yaml b/openapi/task_execution_service.openapi.yaml
index a8b0b10..8d57d8f 100644
--- a/openapi/task_execution_service.openapi.yaml
+++ b/openapi/task_execution_service.openapi.yaml
@@ -525,6 +525,40 @@ components:
           items:
             type: string
           example: us-west-1
+        backend_parameters:
+            type: object
+            additionalProperties:
+                type: string
+            description: |-
+                Key/value pairs for backend configuration.
+                ServiceInfo shall return a list of keys that a backend supports.
+                Keys are case insensitive.
+                It is expected that clients pass all runtime or hardware requirement key/values
+                that are not mapped to existing tesResources properties to backend_parameters.
+                Backends shall log system warnings if a key is passed that is unsupported.
+                Backends shall not store or return unsupported keys if included in a task.
+                If backend_parameters_strict equals true,
+                backends should fail the task if any key/values are unsupported, otherwise,
+                backends should attempt to run the task
+                Intended uses include VM size selection, coprocessor configuration, etc.
+                Example:
+                ```
+                {
+                  "backend_parameters" : {
+                    "VmSize" : "Standard_D64_v3"
+                  }
+                }
+                ```
+            example:
+                "VmSize" : "Standard_D64_v3"
+        backend_parameters_strict:
+            type: boolean
+            description: |-
+                If set to true, backends should fail the task if any backend_parameters 
+                key/values are unsupported, otherwise, backends should attempt to run the task
+            format: boolean
+            default: false
+            example: false
       description: Resources describes the resources requested by a task.
     tesServiceType:
       allOf:
@@ -552,6 +586,14 @@ components:
             example:
                - file:///path/to/local/funnel-storage
                - s3://ohsu-compbio-funnel/storage
+          tesResources_backend_parameters:
+            type: array
+            description: |-
+              Lists all tesResources.backend_parameters keys supported 
+              by the service
+            items:
+              type: string
+            example: ["VmSize"]
           type:
             $ref: '#/components/schemas/tesServiceType'
     tesState: