diff --git a/system-variables.md b/system-variables.md
index 89cee140d97d2..17cb5f0b460c8 100644
--- a/system-variables.md
+++ b/system-variables.md
@@ -2956,6 +2956,15 @@ Query OK, 0 rows affected (0.09 sec)
 
 </CustomContent>
 
+### `tidb_enable_ts_validation` <span class="version-mark">New in v9.0.0</span>
+
+- Scope: GLOBAL
+- Persists to cluster: Yes
+- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
+- Type: Boolean
+- Default value: `ON`
+- This variable controls whether TiDB validates the timestamp in a request before sending the request to TiKV. If an invalid timestamp is detected in the request, TiDB rejects sending it to avoid data corruption.
+
 ### tidb_enable_tso_follower_proxy <span class="version-mark">New in v5.3.0</span>
 
 > **Note:**