diff --git a/articles/communication-services/concepts/service-limits.md b/articles/communication-services/concepts/service-limits.md
index a28a8bd48ef38..9624a003a7888 100644
--- a/articles/communication-services/concepts/service-limits.md
+++ b/articles/communication-services/concepts/service-limits.md
@@ -214,9 +214,11 @@ Azure Communication Services supports chat.
 | Operation | Scope | Limit per 10 seconds | Limit per minute |
 | --- | --- | --- | --- |
 | Create chat thread | Per user | 10 | - |
+| Create chat thread | Per resource | - | 3000 |
 | Delete chat thread | Per user | 10 | - |
 | Update chat thread | Per chat thread | 5 | - |
 | Add participants or remove participants | Per chat thread | 10 | 30 |
+| Add participants | Per resource | - | 3000 |
 | Get chat thread or list chat threads | Per user | 50 | - |
 | Get chat message | Per user, per chat thread | 50 | - |
 | Get chat message | Per chat thread | 250 | - |