diff --git a/README.md b/README.md
index 57f310caa..8920d61dc 100644
--- a/README.md
+++ b/README.md
@@ -89,3 +89,4 @@ 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.
+Hello World
diff --git a/cmd/benchdb/README.md b/cmd/benchdb/README.md
index 2bff0e6d5..e3a6317ba 100644
--- a/cmd/benchdb/README.md
+++ b/cmd/benchdb/README.md
@@ -60,3 +60,4 @@ The PD address. Default is `127.0.0.1:2379`.
 ### `L`
 
 The log level. Default is `warn`.
+Hello World
diff --git a/cmd/benchfilesort/README.md b/cmd/benchfilesort/README.md
index 79dd784a5..962babc3b 100644
--- a/cmd/benchfilesort/README.md
+++ b/cmd/benchfilesort/README.md
@@ -119,3 +119,4 @@ The `run` command supports the following arguments:
 
 * `cpuprofile` (default: "")
   Turn on the CPU profile
+Hello World
diff --git a/cmd/explaintest/README.md b/cmd/explaintest/README.md
index bcb5ea76f..c1e4abc59 100644
--- a/cmd/explaintest/README.md
+++ b/cmd/explaintest/README.md
@@ -63,3 +63,4 @@ cd cmd/explaintest
 ./run-tests.sh -c [casename]
 ``
 It will generate result and stats base on last execution, and then we can reuse them or open editor to do some modify.
+Hello World
diff --git a/cmd/importer/README.md b/cmd/importer/README.md
index 1e0f44e15..33046e980 100644
--- a/cmd/importer/README.md
+++ b/cmd/importer/README.md
@@ -175,3 +175,4 @@ tinyint | smallint | int | bigint | float | double | decimal | date | time | dat
 
 ## License
 Apache 2.0 license. See the [LICENSE](../../LICENSE) file for details.
+Hello World
diff --git a/docs/design/README.md b/docs/design/README.md
index c493556ca..ef5de4931 100644
--- a/docs/design/README.md
+++ b/docs/design/README.md
@@ -47,3 +47,4 @@ Writing a design document can promote us to think deliberately and gather knowle
 - [Proposal: Support Skyline Pruning](./2019-01-25-skyline-pruning.md)
 - [Proposal: Support Index Merge](./2019-04-11-indexmerge.md)
 - [Proposal: Support Automatically Index Recommendation](./2019-11-05-index-advisor.md)
+Hello World
diff --git a/plugin/README.md b/plugin/README.md
index 7735c7cd1..d84d2959e 100644
--- a/plugin/README.md
+++ b/plugin/README.md
@@ -1,3 +1,4 @@
 # The Plugin Framework
 
 https://github.com/pingcap/tidb/blob/master/docs/design/2018-12-10-plugin-framework.md
+Hello World