diff --git a/api.yaml b/api.yaml
index 3893b50..136d6ef 100644
--- a/api.yaml
+++ b/api.yaml
@@ -362,16 +362,17 @@ paths:
       summary: Adds a new asset to an article
       requestBody:
         content:
-          application/json:
+          multipart/form-data:
             schema:
               type: object
               properties:
                 name:
                   type: string
-                  description: Name of the asset
-                content:
+                  description: Name of the file
+                file:
                   type: string
-                  description: The asset itself. Must be encoded as base64
+                  format: binary
+                  description: The file itself
       security:
         - cookie: []
       responses: