diff --git a/README.md b/README.md
index f29b779..e7352fb 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,7 @@ jobs:
 ### `clippy_flags`
 
 Optional. clippy flags. (cargo clippy --color never -q --message-format json `<clippy_flags>`)
+For example, `clippy_flags: -- -Dwarnings`.
 
 ### `tool_name`
 
@@ -53,6 +54,17 @@ Optional. Working directory relative to the root directory.
 Optional. Reporter of reviewdog command [github-pr-check,github-pr-review].
 It's same as `-reporter` flag of reviewdog.
 
+#### github-pr-review
+|`cargo clippy`|`cargo clippy -- -Dwarnings`|
+|---|---|
+|<img width="913" alt="github-pr-review_warning" src="https://user-images.githubusercontent.com/17407489/205067105-4511a31e-9e95-407c-ae44-c8699e46d780.png">|<img width="911" alt="github-pr-review_error" src="https://user-images.githubusercontent.com/17407489/205067361-f22254a8-7211-457e-82a1-006a4cfc3c22.png">|
+
+#### github-pr-check
+|`cargo clippy`|`cargo clippy -- -Dwarnings`|
+|---|---|
+|<img width="855" alt="github-pr-check_warning" src="https://user-images.githubusercontent.com/17407489/205067697-029aceba-a143-4183-85de-a4ff22c2ed27.png">|<img width="867" alt="github-pr-check_error" src="https://user-images.githubusercontent.com/17407489/205067734-fc7decb6-21df-49b0-9cd6-83bc40cd26ec.png">|
+
+
 ### `filter_mode`
 
 Optional. Filtering mode for the reviewdog command [added,diff_context,file,nofilter].
diff --git a/dist/index.js b/dist/index.js
index 0a94336..056e5e5 100644
Binary files a/dist/index.js and b/dist/index.js differ
diff --git a/dist/index.js.map b/dist/index.js.map
index 59c7484..cef6ec6 100644
Binary files a/dist/index.js.map and b/dist/index.js.map differ
diff --git a/src/main.ts b/src/main.ts
index 393847d..4ffa283 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -13,7 +13,7 @@ async function run(): Promise<void> {
   try {
     const reviewdogVersion = core.getInput('reviewdog_version') || 'latest'
     const toolName = core.getInput('tool_name') || 'clippy'
-    const clippyFlags = core.getInput('clippy_flags');
+    const clippyFlags = core.getInput('clippy_flags')
     const level = core.getInput('level') || 'error'
     const reporter = core.getInput('reporter') || 'github-pr-check'
     const filterMode = core.getInput('filter_mode') || 'added'
@@ -38,7 +38,15 @@ async function run(): Promise<void> {
         const output: string[] = []
         await exec.exec(
           'cargo',
-          ['clippy', '--color', 'never', '-q', '--message-format', 'json', ...parse(clippyFlags)],
+          [
+            'clippy',
+            '--color',
+            'never',
+            '-q',
+            '--message-format',
+            'json',
+            ...parse(clippyFlags)
+          ],
           {
             cwd,
             ignoreReturnCode: true,
@@ -64,11 +72,13 @@ async function run(): Promise<void> {
 
                 core.debug('this is a compiler-message!')
                 const span = content.message.spans[0]
+                const messageLevel =
+                  content.message.level === 'warning' ? 'w' : 'e'
                 const rendered =
                   reporter === 'github-pr-review'
                     ? ` \n<pre><code>${content.message.rendered}</code></pre>\n__END__`
                     : `${content.message.rendered}\n__END__`
-                const ret = `${span.file_name}:${span.line_start}:${span.column_start}:${rendered}`
+                const ret = `${span.file_name}:${span.line_start}:${span.column_start}:${messageLevel}:${rendered}`
                 output.push(ret)
               }
             }
@@ -80,8 +90,10 @@ async function run(): Promise<void> {
         return await exec.exec(
           reviewdog,
           [
-            '-efm=%E%f:%l:%c:%m',
+            '-efm=<pre><code>%E%f:%l:%c:%t:%m',
+            '-efm=%E%f:%l:%c:%t:%m',
             '-efm=%Z__END__',
+            '-efm=%C%m</code></pre>',
             '-efm=%C%m',
             '-efm=%C',
             `-name=${toolName}`,