update

pingcap · Jun 9, 2022 · c410830 · c410830
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commit c410830
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diff --git a/docs/design/2022-03-31-concurrent-ddl-framawork.md b/docs/design/2022-03-31-concurrent-ddl-framawork.md
@@ -276,6 +276,8 @@ be executed successfully by the other old TiDB instance.
 
 We will use [schrddl](https://github.com/PingCAP-QE/schrddl) test the concurrent DDL framework.
 
+`Schrddl` is a fuzz test tool that generate DDL and DML SQLs sends to TiDB. For more information, you can read this document
+
 ### Benchmark Tests