diff --git a/.github/workflows/readme-test.yml b/.github/workflows/readme-test.yml
index 9613beb..0340a3a 100644
--- a/.github/workflows/readme-test.yml
+++ b/.github/workflows/readme-test.yml
@@ -24,7 +24,7 @@ jobs:
       - name: Test with pytest
         run: pytest test_src
 
-      - uses: tokusumi/markdown-embed-code@main
+      - uses: tokusumi/markdown-embed-code@v0.1.1
         with:
           markdown: "README.md"
 
diff --git a/README.md b/README.md
index e2cf996..fe9dc02 100644
--- a/README.md
+++ b/README.md
@@ -2,24 +2,18 @@
 
 ![Test code and embed into README](https://github.com/tokusumi/readme-code-testing/workflows/Test%20code%20and%20embed%20into%20README/badge.svg)
 
-
 This repo demonstrates [Markdown Embed Code From File](https://github.com/marketplace/actions/markdown-embed-code-from-file) (GitHub Action).
 
-
 This would helps testing for your code within readme (actually for markdown).
 
-
 You could put code in external file and test them, as same as ordinary testing your code. You don't need copy & paste code and feel anxisous about compatibility anymore.
 
-
 ## Mark your code for embedding
 
 This action could inspect your code, if you add a file path in code block as "\`\`\`lang:external/file/path.py\`\`\`".
 
-
 The following code block has a file path `src/helloworld.py`:
 
-
 ```python:src/helloworld.py
 def hello():
     return "world"
@@ -27,19 +21,16 @@ def hello():
 
 See with [src/helloworld.py]() as:
 
-
 * Synchronized code.
 * Highlighting code in readme.
 * Not affected code rendering.
 
 And notice that nothing to do re-embedding new/modified code. This action overrides code if you change code in external file.
 
-
 ### Multiple use
 
 You might add one file path (ex. [src/mul.py]()) for multiple code blocks:
 
-
 ```py:src/mul.py
 from math import pow
 
@@ -49,7 +40,6 @@ def multiple(x):
 
 It works!:
 
-
 ```py:src/mul.py
 from math import pow
 
@@ -59,23 +49,18 @@ def multiple(x):
 
 However, the other is not available.
 
-
 ### Non-existent file
 
 Notice that this action goes to "fail" if a file you add does not exist.
 
-
 ## Multilingual
 
 This action could work for any programming "language".
 
-
 Ideally you could write as "\`\`\`lang:external/file/path.py\`\`\`", but actually this action does not inspect "lang", just read path and copy&paste strings into target code block in markdown.
 
-
 So, missing "lang" is available:
 
-
 ```:src/helloworld.sh
 #!/bin/bash