diff --git a/tidb-cloud/tidb-cloud-glossary.md b/tidb-cloud/tidb-cloud-glossary.md
index b335ddfb010a1..2593ac3a60b29 100644
--- a/tidb-cloud/tidb-cloud-glossary.md
+++ b/tidb-cloud/tidb-cloud-glossary.md
@@ -154,7 +154,7 @@ Currently, only the following types of TiDB Cloud resources support the Recycle
 
 - TiDB Region
 
-    The basic unit of data in TiDB. TiKV divides the Key-Value space into a series of consecutive Key segments, and each segment is called a Region. The default size limit for each Region is 96 MB and can be configured.
+    The basic unit of data in TiDB. TiKV divides the Key-Value space into a series of consecutive Key segments, and each segment is called a Region. By default, the [estimated size for a newly split Region](https://docs.pingcap.com/tidb/stable/tikv-configuration-file/#region-split-size) is 256 MiB for TiDB v8.4.0 and later versions, and 96 MiB for TiDB versions earlier than v8.4.0.
 
 ### replica