diff --git a/documentation/openapi.yml b/documentation/openapi.yml
index 39638944..447fe661 100644
--- a/documentation/openapi.yml
+++ b/documentation/openapi.yml
@@ -13,7 +13,7 @@ info:
   license:
     name: MPL-2.0
     url: https://www.mozilla.org/en-US/MPL/2.0/
-  version: "0.1"
+  version: "0.4"
 externalDocs:
   description: The Divvi Up API repository
   url: https://github.com/divviup/divviup-api
@@ -805,6 +805,25 @@ components:
                 type: string
         chunk_length:
           type: number
+        dp_strategy:
+          type: object
+          properties:
+            dp_strategy:
+              type: string
+              enum: [NoDifferentialPrivacy, PureDpDiscreteLaplace]
+            budget:
+              type: object
+              properties:
+                epsilon:
+                  type: array
+                  minItems: 2
+                  maxItems: 2
+                  items:
+                    type: array
+                    items:
+                      type: number
+                      minimum: 0
+                      maximum: 4294967295
       required: [type]
     ApiToken:
       type: object