Update sync-diff-inspector-overview.md (#18125)

pingcap · Jul 26, 2024 · c600447 · c600447
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diff --git a/sync-diff-inspector/sync-diff-inspector-overview.md b/sync-diff-inspector/sync-diff-inspector-overview.md
@@ -271,6 +271,8 @@ Average Speed: 113.277149MB/s
 - `RESULT`：校验是否完成。如果设置了 `skip-non-existing-table = true`，对于上游或下游不存在的表，该列的值将为 `skipped`
 - `STRUCTURE EQUALITY`：表结构是否相同
 - `DATA DIFF ROWS`：即 `rowAdd`/`rowDelete`，表示该表修复需要增加/删除的行数
+- `UPCOUNT`：表示该表在上游数据源的行数
+- `DOWNCOUNT`：表示该表在下游数据源的行数
 
 #### SQL 修复