diff --git a/common/api.yaml b/common/api.yaml
index f2b7b1a..7c30975 100644
--- a/common/api.yaml
+++ b/common/api.yaml
@@ -102,6 +102,11 @@ paths:
                 description:
                   type: string
                   description: The description of the allowance or expense.
+      responses:
+        200:
+          description: The allowance was updated successfully.
+        400:
+          description: The allowance could not be updated.
 
   /user/{userId}/history:
     get:
@@ -175,6 +180,19 @@ paths:
                 weight:
                   type: integer
                   description: How much money goes to this goal, relative to all other goals.
+      responses:
+        201:
+          description: The goal was created successfully.
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  id:
+                    type: integer
+                    description: The goal ID
+        400:
+          description: The goal could not be created.
     put:
       summary: Bulk updating of goals
       parameters:
@@ -199,6 +217,11 @@ paths:
                   weight:
                     type: integer
                     description: How much money goes to this goal, relative to all other goals.
+      responses:
+        200:
+          description: The goals were updated successfully.
+        404:
+          description: The goals could not be found.
 
   /user/{userId}/goal/{goalId}:
     get:
@@ -300,6 +323,11 @@ paths:
           required: true
           schema:
             type: integer
+      responses:
+        200:
+          description: The goal was completed successfully.
+        404:
+          description: The goal could not be found.
 
   /tasks:
     get:
@@ -331,6 +359,17 @@ paths:
                 assigned:
                   type: integer
                   description: The user ID of the user assigned to the task
+      responses:
+        202:
+          description: The task was created successfully.
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  id:
+                    type: integer
+                    description: The task ID
 
   /task/{id}:
     get:
@@ -386,6 +425,11 @@ paths:
                 assigned:
                   type: integer
                   description: The user ID of the user assigned to the task
+      responses:
+        200:
+          description: The task was updated successfully.
+        404:
+          description: The task could not be found.
 
 components:
   schemas: