diff --git a/README.md b/README.md
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--- a/README.md
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@@ -89,3 +89,7 @@ TiDB is under the Apache 2.0 license. See the [LICENSE](./LICENSE) file for deta
 ## Acknowledgments
 - Thanks [cznic](https://github.com/cznic) for providing some great open source tools.
 - Thanks [GolevelDB](https://github.com/syndtr/goleveldb), [BoltDB](https://github.com/boltdb/bolt), and [RocksDB](https://github.com/facebook/rocksdb) for their powerful storage engines.
+this is step 2
+this is step 3
+this is step 4
+previous_step.modified_files=[README.md]
diff --git a/README.txt b/README.txt
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@@ -0,0 +1 @@
+this is step 1
diff --git a/my-output.txt b/my-output.txt
new file mode 100644
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@@ -0,0 +1 @@
+this is step 5