diff --git a/dev/reference/tools/data-migration/usage-scenarios/shard-merge.md b/dev/reference/tools/data-migration/usage-scenarios/shard-merge.md
index d1abae651c8c..4d2bd37116a6 100644
--- a/dev/reference/tools/data-migration/usage-scenarios/shard-merge.md
+++ b/dev/reference/tools/data-migration/usage-scenarios/shard-merge.md
@@ -216,7 +216,7 @@ routes:
 filters:
   user-filter-rule:
     schema-pattern: "user"
-    events: ["truncate table", "drop table", "delete"， "drop database"]
+    events: ["truncate table", "drop table", "delete", "drop database"]
     action: Ignore
   sale-filter-rule:
     schema-pattern: "store_*"
diff --git a/dev/reference/tools/data-migration/usage-scenarios/simple-synchronization.md b/dev/reference/tools/data-migration/usage-scenarios/simple-synchronization.md
index ff252dc3ad9b..e3f47a261970 100644
--- a/dev/reference/tools/data-migration/usage-scenarios/simple-synchronization.md
+++ b/dev/reference/tools/data-migration/usage-scenarios/simple-synchronization.md
@@ -154,7 +154,7 @@ mysql-instances:
   -
     source-id: "instance-1"
     route-rules: ["instance-1-user-rule"]
-    filter-rules: ["log-filter-rule", "user-filter-rule" , "store-filter-rule"]
+    filter-rules: ["log-filter-rule", "user-filter-rule", "store-filter-rule"]
     black-white-list:  "log-ignored"
     mydumper-config-name: "global"
     loader-config-name: "global"
@@ -162,7 +162,7 @@ mysql-instances:
   -
     source-id: "instance-2"
     route-rules: ["instance-2-user-rule", instance-2-store-rule]
-    filter-rules: ["log-filter-rule", "user-filter-rule" , "store-filter-rule"]
+    filter-rules: ["log-filter-rule", "user-filter-rule", "store-filter-rule"]
     black-white-list:  "log-ignored"
     mydumper-config-name: "global"
     loader-config-name: "global"
@@ -170,7 +170,7 @@ mysql-instances:
   -
     source-id: "instance-3"
     route-rules: ["instance-3-user-rule", instance-3-store-rule]
-    filter-rules: ["log-filter-rule", "user-filter-rule" , "store-filter-rule"]
+    filter-rules: ["log-filter-rule", "user-filter-rule", "store-filter-rule"]
     black-white-list:  "log-ignored"
     mydumper-config-name: "global"
     loader-config-name: "global"