docs: add organisation ownership transfer guide (#2601)

apps/docs/content/docs/users/organisations/members.mdx

@@ -22,6 +22,37 @@ Organisation members have different permission levels that determine what they c
   organisation.
 </Callout>
 
+## Transferring Organisation Ownership
+
+Organisation ownership cannot be transferred through the regular organisation settings. Only a Documenso instance administrator can transfer ownership through the admin panel.
+
+If you are using Documenso Cloud, contact support to request an ownership transfer. If you are self-hosting, an instance administrator can follow the steps below.
+
+The target user must already be a member of the organisation.
+
+{/* prettier-ignore */}
+<Steps>
+  <Step>
+    Navigate to **Admin > Organisations** and select the organisation.
+  </Step>
+  <Step>
+    In the **Organisation Members** table, find the target member and click **Update role**.
+  </Step>
+  <Step>
+    Select **Owner** from the role dropdown and click **Update**.
+  </Step>
+</Steps>
+
+After the transfer:
+
+- The new owner is promoted to Admin if they previously held a lower role (Manager or Member).
+- The previous owner retains their Admin role and remains a member of the organisation.
+- Only one user can be the owner at a time.
+
+<Callout type="warn">
+  The current owner cannot be demoted below Admin. Transfer ownership to another member first.
+</Callout>
+
 ## Team Member Roles
 
 Teams have three roles with different permission levels: