diff --git a/dumpling-overview.md b/dumpling-overview.md
index ae595e2795324..99f90a1d2e090 100644
--- a/dumpling-overview.md
+++ b/dumpling-overview.md
@@ -332,7 +332,7 @@ Finally, all the exported data can be imported back to TiDB using [TiDB Lightnin
 | `-V` or `--version`          | Output the Dumpling version and exit directly                                                                                                                                                                                                                                                                                      |
 | `-B` or `--database`         | Export specified databases                                                                                                                                                                                                                                                                                                         |
 | `-T` or `--tables-list`      | Export specified tables                                                                                                                                                                                                                                                                                                            |
-| `-f` or `--filter`           | Export tables that match the filter pattern. For the filter syntax, see [table-filter](/table-filter.md).                                                                                                                                                                                                                          | `"\*.\*"` (export all databases or tables) |
+| `-f` or `--filter`           | Export tables that match the filter pattern. For the filter syntax, see [table-filter](/table-filter.md).                                                                                                                                                                                                                          |    `[\*.\*,!/^(mysql|sys|INFORMATION_SCHEMA|PERFORMANCE_SCHEMA|METRICS_SCHEMA|INSPECTION_SCHEMA)$/.\*]` (export all databases or tables excluding system schemas) |
 | `--case-sensitive`           | whether table-filter is case-sensitive                                                                                                                                                                                                                                                                                             | false (case-insensitive)                   |
 | `-h` or `--host`             | The IP address of the connected database host                                                                                                                                                                                                                                                                                      | "127.0.0.1"                                |
 | `-t` or `--threads`          | The number of concurrent backup threads                                                                                                                                                                                                                                                                                            | 4                                          |
diff --git a/table-filter.md b/table-filter.md
index d3db62a5c568d..7272e7fd1ada1 100644
--- a/table-filter.md
+++ b/table-filter.md
@@ -241,7 +241,7 @@ The filtered outcome is as follows:
 
 > **Note:**
 >
-> In TiDB tools, the system schemas are always excluded regardless of the table filter settings. The system schemas are:
+> In TiDB tools, the system schemas are always excluded in the default configuration. The system schemas are:
 >
 > * `INFORMATION_SCHEMA`
 > * `PERFORMANCE_SCHEMA`