diff --git a/integrations/sources/kafka.mdx b/integrations/sources/kafka.mdx
index a85e3beb..24a423e6 100644
--- a/integrations/sources/kafka.mdx
+++ b/integrations/sources/kafka.mdx
@@ -329,7 +329,7 @@ To learn about compatibility types for Schema Registry and the changes allowed,
 <Tip>
 **PREMIUM EDITION FEATURE**
 
-This is a Premium Edition feature. All Premium Edition features are available out of box without additional cost on RisingWave Cloud. For self-hosted deployments, users need to purchase a license key to access this feature. To purchase a license key, please contact sales team at [sales@risingwave-labs.com](mailto:sales@risingwave-labs.com).
+This is a Premium Edition feature. All Premium Edition features are available out of the box without additional cost on RisingWave Cloud. For self-hosted deployments, users need to purchase a license key to access this feature. To purchase a license key, please contact sales team at [sales@risingwave-labs.com](mailto:sales@risingwave-labs.com).
 
 For a full list of Premium Edition features, see [RisingWave Premium Edition](/get-started/rw-premium-edition-intro). 
 </Tip>