diff --git a/dev-docs/bidders/colossus.md b/dev-docs/bidders/colossus.md
index a01899d0af..e7b322df75 100644
--- a/dev-docs/bidders/colossus.md
+++ b/dev-docs/bidders/colossus.md
@@ -6,7 +6,7 @@ biddercode: colossus
 usp_supported: true
 schain_supported: true
 media_types: banner, video, native
-userIds: britepoolid, identityLink, unifiedId, id5Id
+userIds: britepoolid, identityLink, unifiedId, id5Id, uid2
 gdpr: true
 pbjs: false
 pbs: true
diff --git a/dev-docs/bidders/colossusssp.md b/dev-docs/bidders/colossusssp.md
index e64677b05d..cb188c5d68 100644
--- a/dev-docs/bidders/colossusssp.md
+++ b/dev-docs/bidders/colossusssp.md
@@ -6,7 +6,7 @@ biddercode: colossusssp
 usp_supported: true
 schain_supported: true
 media_types: banner, video, native
-userIds: britepoolid, identityLink, unifiedId, id5Id
+userIds: britepoolid, identityLink, unifiedId, id5Id, uid2
 gdpr: true
 pbjs: true
 pbs: false
@@ -17,7 +17,8 @@ pbs: false
 {: .table .table-bordered .table-striped }
 | Name           | Scope    | Description                                              | Example    | Type      |
 |----------------|----------|----------------------------------------------------------|------------|-----------|
-| `placement_id` | required | Placement Id will be generated on Colossus SSP Platform. | `0`        | `integer` |
+| `placement_id` | optional | Placement Id will be generated on Colossus SSP Platform. Use instead of group_id | `0`        | `integer` |
+| `group_id`     | optional | Group Id will be generated on Colossus SSP Platform. Use instead of placement_id  | `0`        | `integer` |
 | `traffic`      | optional | Type traffic                                             | `'banner'` | `string`  |
 
 *For colossus prebid server parametres, look into colossus.md*