diff --git a/dynamic-config.md b/dynamic-config.md
index a94a35c588f3f..97e2554b7964b 100644
--- a/dynamic-config.md
+++ b/dynamic-config.md
@@ -94,7 +94,7 @@ If an error occurs during the batch modification, a warning is returned:
 {{< copyable "sql" >}}
 
 ```sql
-set config tikv `log-level`='warn';
+set config tikv `log-level`='warn'; -- The correct config item is `log.level`.
 ```
 
 ```sql