diff --git a/mysql-schema.md b/mysql-schema.md
index 64d709398f245..184c53e68b073 100644
--- a/mysql-schema.md
+++ b/mysql-schema.md
@@ -85,8 +85,8 @@ Currently, the `help_topic` is NULL.
 
 ## System tables related to metadata locks
 
-* `tidb_mdl_view`：a view of metadata locks. You can use it to view information about the currently blocked DDL statements
-* `tidb_mdl_info`：used internally by TiDB to synchronize metadata locks across nodes
+* `tidb_mdl_view`: a view of metadata locks. You can use it to view information about the currently blocked DDL statements
+* `tidb_mdl_info`: used internally by TiDB to synchronize metadata locks across nodes
 
 ## System tables related to DDL statements