diff --git a/.github/workflows/reviewdog.yml b/.github/workflows/reviewdog.yml
index 0c95f1a..977ab15 100644
--- a/.github/workflows/reviewdog.yml
+++ b/.github/workflows/reviewdog.yml
@@ -49,6 +49,16 @@ jobs:
           reporter: github-check
           level: warning
 
+  markdownlint:
+    name: runner / markdownlint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: reviewdog/action-markdownlint@v0
+        with:
+          reporter: github-check
+          level: warning
+
   misspell:
     name: runner / misspell
     runs-on: ubuntu-latest
diff --git a/.markdownlint.yml b/.markdownlint.yml
new file mode 100644
index 0000000..e5dd1de
--- /dev/null
+++ b/.markdownlint.yml
@@ -0,0 +1,43 @@
+# refs. https://github.com/DavidAnson/markdownlint/blob/HEAD/schema/.markdownlint.yaml
+---
+default: true
+
+# MD003/heading-style/header-style - Heading style
+MD003:
+  # Heading style
+  style: atx
+
+# MD004/ul-style - Unordered list style
+MD004:
+  # List style
+  style: dash
+
+# MD007/ul-indent - Unordered list indentation
+MD007:
+  # Spaces for indent
+  indent: 4
+
+# MD013/line-length - Line length
+MD013:
+  # Number of characters for code blocks
+  code_block_line_length: 120
+
+# MD029/ol-prefix - Ordered list item prefix
+MD029:
+  # List style
+  style: ordered
+
+# MD035/hr-style - Horizontal rule style
+MD035:
+  # Horizontal rule style
+  style: ---
+
+# MD049/emphasis-style - Emphasis style should be consistent
+MD049:
+  # Emphasis style should be consistent
+  style: asterisk
+
+# MD050/strong-style - Strong style should be consistent
+MD050:
+  # Strong style should be consistent
+  style: asterisk
diff --git a/README.md b/README.md
index ef1ba2d..6801cbb 100644
--- a/README.md
+++ b/README.md
@@ -84,13 +84,15 @@ jobs:
 ### Release
 
 #### [haya14busa/action-bumpr](https://github.com/haya14busa/action-bumpr)
+
 You can bump version on merging Pull Requests with specific labels (bump:major,bump:minor,bump:patch).
 Pushing tag manually by yourself also work.
 
 #### [haya14busa/action-update-semver](https://github.com/haya14busa/action-update-semver)
 
-This action updates major/minor release tags on a tag push. e.g. Update v1 and v1.2 tag when released v1.2.3.
-ref: https://help.github.com/en/articles/about-actions#versioning-your-action
+This action updates major/minor release tags on a tag push.
+e.g. Update v1 and v1.2 tag when released v1.2.3.
+ref: <https://help.github.com/en/articles/about-actions#versioning-your-action>
 
 ### Lint - reviewdog integration
 
@@ -107,11 +109,14 @@ Supported linters:
 - [reviewdog/action-shfmt](https://github.com/reviewdog/action-shfmt)
 - [reviewdog/action-actionlint](https://github.com/reviewdog/action-actionlint)
 - [reviewdog/action-yamllint](https://github.com/reviewdog/action-yamllint)
+- [reviewdog/action-markdownlint](https://github.com/reviewdog/action-markdownlint)
 - [reviewdog/action-misspell](https://github.com/reviewdog/action-misspell)
 - [reviewdog/action-alex](https://github.com/reviewdog/action-alex)
 
 ### Dependencies Update Automation
-This repository uses [reviewdog/action-depup](https://github.com/reviewdog/action-depup) to update
-reviewdog version.
+
+This repository uses [reviewdog/action-depup] to update reviewdog version.
+
+[reviewdog/action-depup]:https://github.com/reviewdog/action-depup
 
 ![reviewdog depup demo](https://user-images.githubusercontent.com/3797062/73154254-170e7500-411a-11ea-8211-912e9de7c936.png)