diff --git a/public/openapi/write/posts/owner.yaml b/public/openapi/write/posts/owner.yaml
index b69e0b5b44..98283f8e96 100644
--- a/public/openapi/write/posts/owner.yaml
+++ b/public/openapi/write/posts/owner.yaml
@@ -1,6 +1,6 @@
 post:
   tags:
-    - Posts
+    - posts
   summary: Change owner of one or more posts
   description: Change the owner of the posts identified by pids to the user uid.
   requestBody:
diff --git a/public/openapi/write/posts/pid/owner.yaml b/public/openapi/write/posts/pid/owner.yaml
index e49a627963..0e1a701faa 100644
--- a/public/openapi/write/posts/pid/owner.yaml
+++ b/public/openapi/write/posts/pid/owner.yaml
@@ -2,7 +2,7 @@ put:
   summary: Change owner of a post
   description: Change the owner (uid) of a post identified by pid.
   tags:
-    - Posts
+    - posts
   parameters:
     - name: pid
       in: path