diff --git a/docs/objects/Library.yaml b/docs/objects/Library.yaml
index c7a2a52e0..bab503ccf 100644
--- a/docs/objects/Library.yaml
+++ b/docs/objects/Library.yaml
@@ -10,6 +10,12 @@ components:
       description: The ID of the library.
       format: uuid
       example: 'e4bb1afb-4a4f-4dd6-8be0-e615d233185b'
+    libraryIdNullable:
+      type: string
+      description: The ID of the library. Applies to all libraries if `null`.
+      format: uuid
+      nullable: true
+      example: 'e4bb1afb-4a4f-4dd6-8be0-e615d233185b'
     libraryName:
       description: The name of the library.
       type: string
diff --git a/docs/objects/Notification.yaml b/docs/objects/Notification.yaml
index e016aca95..bb9ce8bda 100644
--- a/docs/objects/Notification.yaml
+++ b/docs/objects/Notification.yaml
@@ -53,7 +53,7 @@ components:
         id:
           $ref: '#/components/schemas/notificationId'
         libraryId:
-          $ref: './Library.yaml#/components/schemas/libraryId'
+          $ref: './Library.yaml#/components/schemas/libraryIdNullable'
         eventName:
           $ref: '#/components/schemas/notificationEventName'
         urls: