diff --git a/openapi/components/schemas/candidate.yaml b/openapi/components/schemas/candidate.yaml
index 7fbba1f..90842af 100644
--- a/openapi/components/schemas/candidate.yaml
+++ b/openapi/components/schemas/candidate.yaml
@@ -1,9 +1,10 @@
 type: object
 properties:
   id:
-    type: string
+    type: integer
     description: A unique identifier.
     readOnly: true
+    example: 4
   name:
     type: string
     description: Unique but short name of the candidate.
diff --git a/openapi/components/schemas/grade.yaml b/openapi/components/schemas/grade.yaml
index f1b0194..da55977 100644
--- a/openapi/components/schemas/grade.yaml
+++ b/openapi/components/schemas/grade.yaml
@@ -1,8 +1,9 @@
 type: object
 properties:
   id:
-    type: string
+    type: integer
     description: A unique identifier
+    example: 0
     readOnly: true
   name:
     type: string
diff --git a/openapi/components/schemas/judgment.yaml b/openapi/components/schemas/judgment.yaml
index 3e8716a..2c73a19 100644
--- a/openapi/components/schemas/judgment.yaml
+++ b/openapi/components/schemas/judgment.yaml
@@ -1,9 +1,11 @@
 type: object
 properties:
   id:
-    type: string
+    type: integer
     description: A unique identifier
+    example: 4
     readOnly: true
   grade:
-    type: string
+    type: integer
     description: The grade item, according to the grades array defined when creating the poll.
+    example: 2