diff --git a/tidb-configuration-file.md b/tidb-configuration-file.md
index cae43f97ac3c3..038cee66e5b19 100644
--- a/tidb-configuration-file.md
+++ b/tidb-configuration-file.md
@@ -501,13 +501,13 @@ The Plan Cache configuration of the `PREPARE` statement.
 
 - The `keepalive` time interval of the RPC connection between TiDB and TiKV nodes. If there is no network packet within the specified time interval, the gRPC client executes `ping` command to TiKV to see if it is alive.
 - Default: `10`
-- unit: second
+- Unit: second
 
 ### `grpc-keepalive-timeout`
 
 - The timeout of the RPC `keepalive` check between TiDB and TiKV nodes.
 - Default value: `3`
-- unit: second
+- Unit: second
 
 ### `commit-timeout`
 
@@ -524,7 +524,7 @@ The Plan Cache configuration of the `PREPARE` statement.
 
 - Waits for `max-batch-wait-time` to encapsulate the data packets into a large packet in batch and send it to the TiKV node. It is valid only when the value of `tikv-client.max-batch-size` is greater than `0`. It is recommended not to modify this value.
 - Default value: `0`
-- unit: nanoseconds
+- Unit: nanoseconds
 
 ### `batch-wait-size`