diff --git a/src/openapi/contracts/contracts-crud.yaml b/src/openapi/contracts/contracts-crud.yaml
index ac961e4..09e1de6 100644
--- a/src/openapi/contracts/contracts-crud.yaml
+++ b/src/openapi/contracts/contracts-crud.yaml
@@ -216,6 +216,7 @@ paths:
                               "created": "2024-06-02 15:01:00.000",
                               "updated": "2024-06-02 15:01:00.000",
                               "state": "invoice_created",
+                              "isCredit": false,
                             },
                             {
                               "contractInvoiceId": "1c345237-4d84-47f0-93c2-7b94338e3355",
@@ -224,6 +225,7 @@ paths:
                               "created": "2024-07-02 15:01:00.000",
                               "updated": "2024-07-02 15:01:00.000",
                               "state": "invoice_created",
+                              "isCredit": false,
                             },
                           ],
                         "contractVersions":
@@ -273,6 +275,7 @@ paths:
                               "created": "2024-06-02 15:01:00.000",
                               "updated": "2024-06-02 15:01:00.000",
                               "state": "invoice_created",
+                              "isCredit": false,
                             },
                             {
                               "contractInvoiceId": "1c345237-4d84-47f0-93c2-7b94338e3355",
@@ -281,6 +284,7 @@ paths:
                               "created": "2024-07-02 15:01:00.000",
                               "updated": "2024-07-02 15:01:00.000",
                               "state": "invoice_created",
+                              "isCredit": false,
                             },
                           ],
                         "contractVersions":
@@ -401,6 +405,7 @@ paths:
                             "updated": "2024-07-02 15:01:00.000",
                             "state": "invoice_created",
                             "data": "{json}",
+                            "isCredit": false,
                           },
                         ],
                     },
@@ -568,6 +573,7 @@ paths:
                         "updated": "2024-07-02 15:01:00.000",
                         "state": "invoice_sent",
                         "data": "{json}",
+                        "isCredit": false,
                       },
                       {
                         "contractInvoiceId": "dadff658-4ff5-4eb8-b516-492f1f6c6245",
@@ -577,6 +583,7 @@ paths:
                         "updated": "2024-08-02 15:01:00.000",
                         "state": "invoice_created",
                         "data": "{json}",
+                        "isCredit": false,
                       },
                     ],
                 }
@@ -600,6 +607,7 @@ paths:
                     "updated": "2024-07-02 15:01:00.000",
                     "state": "invoice_created",
                     "data": "{json}",
+                    "isCredit": false,
                   },
               }
       responses:
@@ -684,6 +692,13 @@ paths:
             example: created
           required: false
           description: Invoice state.
+        - in: query
+          name: isCredit
+          schema:
+            type: boolean
+            example: false
+          required: false
+          description: Whether the invoice is a credit invoice.
       responses:
         "200":
           description: OK
@@ -704,6 +719,7 @@ paths:
                         "updated": "2024-06-02 15:01:00.000",
                         "state": "invoice_created",
                         "data": "{json}",
+                        "isCredit": false,
                       },
                       {
                         "contractId": "a7452e22-3894-40cc-87d6-869370a92277",
@@ -714,6 +730,7 @@ paths:
                         "updated": "2024-08-02 15:01:00.000",
                         "state": "invoice_created",
                         "data": "{json}",
+                        "isCredit": false,
                       },
                     ],
                 }
@@ -1049,6 +1066,9 @@ components:
           type: string
           format: json
           example: { json }
+        isCredit:
+          type: boolean
+          example: false
     ContractStatus:
       type: object
       properties: