diff --git a/public/docs/preorder-api.yaml b/public/docs/preorder-api.yaml
index f03e23ea2..d50220191 100644
--- a/public/docs/preorder-api.yaml
+++ b/public/docs/preorder-api.yaml
@@ -14,6 +14,8 @@ servers:
 tags:
   - name: addressdb
     description: Abfrage von GWR Daten
+  - name: preorder
+    description: Informationen zum Netzgebiet und Speichern von Vorbestellungen
 paths:
   /addressdb/findAddress:
     post:
@@ -186,6 +188,50 @@ paths:
             Parameter missing or malformed
         '401':
           description: Unauthorized
+  /preorder:
+    post:
+      tags:
+        - preorder
+      summary: Vorbestellung registrieren
+      description: Registriert eine Vorbestellung
+      operationId: submitPreorder
+      requestBody:
+        description: PreorderRequest object
+        required: true
+        content:
+          'application/json':
+            schema:
+              $ref: '#/components/schemas/preorderRequest'
+          'application/x-www-form-urlencoded':
+            schema:
+              $ref: '#/components/schemas/preorderRequest'
+      responses:
+        '200':
+          description: Successful operation
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  status:
+                    type: string
+                    description: Status string
+                    example: OK
+                  result:
+                    type: object
+                    properties:
+                      code:
+                        type: string
+                        description: Code für Statusabfrage
+        '400':
+          description: |
+            Bad Request
+            
+            Parameter missing or malformed
+        '401':
+          description: Unauthorized
+        '404':
+          description: Adresse oder Wohneinheit nicht gefunden
 components:
   schemas:
     addressComponentSearchRequest:
@@ -235,6 +281,81 @@ components:
           description: Ortschaft
       required:
         - street
+    preorderRequest:
+      type: object
+      properties:
+        type:
+          type: string
+          enum: [provision, order]
+          desciption: Vorbestelltyp (`provision` = Vorsorgeanschluss, `order` = Vollanschluss)
+        address:
+          type: object
+          properties:
+            street:
+              type: string
+              description: Strasse der Anschlussadresse
+            housenumber:
+              type: string
+              description: Hausnummer der Anschlussadresse
+            zip:
+              type: string
+              description: PLZ der Anschlussadresse
+            city:
+              type: string
+              description: Ort der Anschlussadresse
+            block:
+              type: string
+              description: Block der Anschlussadresse
+            stock:
+              type: string
+              description: Stock der Anschlussadresse
+            stiege:
+              type: string
+              description: Stiege der Anschlussadresse
+            tuer:
+              type: string
+              description: Tür der Anschlussadresse
+          required:
+            - street
+            - housenumber
+            - zip
+            - city
+        customer:
+          type: object
+          properties:
+            company:
+              type: string
+              description: Firmenname Kunde
+            uid:
+              type: string
+              description: UID (wenn Firmenkunde)
+            firstname:
+              type: string
+              description: Vorname Kunde
+            lastname:
+              type: string
+              description: Nachname Kunde
+            street:
+              type: string
+              description: Straße Kunde
+            zip:
+              type: string
+              description: PLZ Kunde
+            city:
+              type: string
+              description: Ort Kunde
+            phone:
+              type: string
+              description: Telefonnummer Kunde
+            email:
+              type: string
+              description: Emailadresse Kunde
+          required:
+            - firstname
+            - lastname
+            - street
+            - zip
+            - city
   securitySchemes:
     api_key_header:
       type: apiKey