diff --git a/website/docs/language/settings/backends/cos.mdx b/website/docs/language/settings/backends/cos.mdx
index 67c5686efc..7e47ae7f4b 100644
--- a/website/docs/language/settings/backends/cos.mdx
+++ b/website/docs/language/settings/backends/cos.mdx
@@ -9,7 +9,10 @@ description: >-
 
 Stores the state as an object in a configurable prefix in a given bucket on [Tencent Cloud Object Storage](https://intl.cloud.tencent.com/product/cos) (COS).
 
-This backend supports [state locking](/terraform/language/state/locking).
+This backend supports [state locking](/terraform/language/state/locking). Storing your state in a COS bucket requires the following permissions:
+
+- `CreateTag`, `DeleteTag`, and `DescribeTags` on the tag key `tencentcloud-terraform-lock`
+- `Put`, `Get`, and `Delete` files for the specified bucket's prefix
 
 ~> **Warning!** It is highly recommended that you enable [Object Versioning](https://intl.cloud.tencent.com/document/product/436/19883)
 on the COS bucket to allow for state recovery in the case of accidental deletions and human error.