diff --git a/scripts/docgen/config.ts b/scripts/docgen/config.ts
new file mode 100644
index 0000000..2ec25d5
--- /dev/null
+++ b/scripts/docgen/config.ts
@@ -0,0 +1,9 @@
+import type { Config } from ".";
+
+export const config: Config = {
+  include: [
+    '../../src/**/*.css'
+  ],
+  exclude: [],
+  filename: '.properties.json'
+}
diff --git a/scripts/docgen/index.ts b/scripts/docgen/index.ts
new file mode 100644
index 0000000..006056b
--- /dev/null
+++ b/scripts/docgen/index.ts
@@ -0,0 +1,30 @@
+import path from 'path'
+import fs from 'fs'
+import { findMatchingFiles, Config as FindMatchingFilesConfig } from './lib/findMatchingFiles'
+import { extractProperties } from './lib/extractProperties'
+import { config }from './config'
+
+export type Config =
+  & FindMatchingFilesConfig
+  & {
+    filename: string
+  }
+
+console.time('[docgen]')
+
+const files = findMatchingFiles(config.include, config.exclude)
+
+const writers = files.map(async file => {
+  const filename = path.parse(file).name + config.filename
+  const exportPath = path.join(path.dirname(file), filename)
+
+  const css = await fs.promises.readFile(file, 'utf8')
+  const doc = extractProperties(css)
+  return fs.promises
+    .writeFile(exportPath, JSON.stringify(doc, null, 2), 'utf8')
+    .then(() => console.info(exportPath, '(generated)'))
+})
+
+await Promise.all(writers)
+
+console.timeEnd('[docgen]')
diff --git a/scripts/docgen/lib/extractProperties.ts b/scripts/docgen/lib/extractProperties.ts
new file mode 100644
index 0000000..a0738cc
--- /dev/null
+++ b/scripts/docgen/lib/extractProperties.ts
@@ -0,0 +1,28 @@
+import postcss from 'postcss'
+
+export type Doc = {
+  comments: string
+  property: string
+  syntax: string
+  inherits: boolean
+  'initial-value': string
+}
+
+export function extractProperties(css: string): Doc[] {
+  const docs: Doc[] = []
+
+  const root = postcss.parse(css)
+  root.walkAtRules('property', rule => {
+    const doc: Record<string, unknown> = {}
+
+    rule.walkComments(comment => { doc['comments'] = comment.text })
+
+    rule.walkDecls(/(syntax|inherits|initial-value)/, decl => {
+      doc[decl.prop] = decl.value
+    })
+
+    docs.push(doc as Doc)
+  })
+
+  return docs
+}
diff --git a/scripts/docgen/lib/findMatchingFiles.ts b/scripts/docgen/lib/findMatchingFiles.ts
new file mode 100644
index 0000000..6beb18a
--- /dev/null
+++ b/scripts/docgen/lib/findMatchingFiles.ts
@@ -0,0 +1,14 @@
+import glob from 'glob'
+
+export type Config = {
+  include: string[]
+  exclude?: string[]
+}
+
+export function findMatchingFiles(globs: string[], ignores: string[] = []): string[] {
+  const paths = globs
+    .map(pattern => glob.sync(pattern, { ignore: ignores }))
+    .flat()
+
+  return paths
+}
diff --git a/scripts/docgen/package-lock.json b/scripts/docgen/package-lock.json
new file mode 100644
index 0000000..d04b666
--- /dev/null
+++ b/scripts/docgen/package-lock.json
@@ -0,0 +1,583 @@
+{
+  "name": "docgen",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "docgen",
+      "version": "1.0.0",
+      "devDependencies": {
+        "glob": "^9.3.2",
+        "postcss": "^8.4.21",
+        "ts-node": "^10.9.1"
+      }
+    },
+    "node_modules/@cspotcode/source-map-support": {
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+      "resolved": "https://registry.npmjs.org/@cspotcode/source-map-support/-/source-map-support-0.8.1.tgz",
+      "integrity": "sha512-IchNf6dN4tHoMFIn/7OE8LWZ19Y6q/67Bmf6vnGREv8RSbBVb9LPJxEcnwrcwX6ixSvaiGoomAUvu4YSxXrVgw==",
+      "dev": true,
+      "dependencies": {
+        "@jridgewell/trace-mapping": "0.3.9"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@jridgewell/resolve-uri": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.0.tgz",
+      "integrity": "sha512-F2msla3tad+Mfht5cJq7LSXcdudKTWCVYUgw6pLFOOHSTtZlj6SWNYAp+AhuqLmWdBO2X5hPrLcu8cVP8fy28w==",
+      "dev": true,
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/@jridgewell/sourcemap-codec": {
+      "version": "1.4.14",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.14.tgz",
+      "integrity": "sha512-XPSJHWmi394fuUuzDnGz1wiKqWfo1yXecHQMRf2l6hztTO+nPru658AyDngaBe7isIxEkRsPR3FZh+s7iVa4Uw==",
+      "dev": true
+    },
+    "node_modules/@jridgewell/trace-mapping": {
+      "version": "0.3.9",
+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.9.tgz",
+      "integrity": "sha512-3Belt6tdc8bPgAtbcmdtNJlirVoTmEb5e2gC94PnkwEW9jI6CAHUeoG85tjWP5WquqfavoMtMwiG4P926ZKKuQ==",
+      "dev": true,
+      "dependencies": {
+        "@jridgewell/resolve-uri": "^3.0.3",
+        "@jridgewell/sourcemap-codec": "^1.4.10"
+      }
+    },
+    "node_modules/@tsconfig/node10": {
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+      "dev": true
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+      "dev": true
+    },
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+      "dev": true
+    },
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+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node16/-/node16-1.0.3.tgz",
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+      "dev": true
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+      "dev": true,
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+      },
+      "engines": {
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+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
+        }
+      ],
+      "bin": {
+        "nanoid": "bin/nanoid.cjs"
+      },
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+      }
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+          "url": "https://opencollective.com/postcss/"
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+      "dev": true,
+      "engines": {
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+      }
+    },
+    "node_modules/ts-node": {
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+        "ts-node-script": "dist/bin-script.js",
+        "ts-node-transpile-only": "dist/bin-transpile.js",
+        "ts-script": "dist/bin-script-deprecated.js"
+      },
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+        "@swc/core": ">=1.2.50",
+        "@swc/wasm": ">=1.2.50",
+        "@types/node": "*",
+        "typescript": ">=2.7"
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+        "@swc/core": {
+          "optional": true
+        },
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+      "peer": true,
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+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
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diff --git a/scripts/docgen/package.json b/scripts/docgen/package.json
new file mode 100644
index 0000000..946bab3
--- /dev/null
+++ b/scripts/docgen/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "docgen",
+  "version": "1.0.0",
+  "description": "Generate document for @Property.",
+  "main": "index.ts",
+  "author": "BcRikko",
+  "scripts": {
+    "docgen": "ts-node index.ts"
+  },
+  "type": "module",
+  "devDependencies": {
+    "glob": "^9.3.2",
+    "postcss": "^8.4.21",
+    "ts-node": "^10.9.1"
+  }
+}
diff --git a/scripts/docgen/tsconfig.json b/scripts/docgen/tsconfig.json
new file mode 100644
index 0000000..1499303
--- /dev/null
+++ b/scripts/docgen/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "extends": "../../tsconfig.json",
+  "ts-node": {
+    "esm": true,
+    "experimentalSpecifierResolution": "node",
+  }
+}
diff --git a/src/elements/button/button.css b/src/elements/button/button.css
index bbc977e..e6b2ac0 100644
--- a/src/elements/button/button.css
+++ b/src/elements/button/button.css
@@ -1,16 +1,19 @@
 @property --nes-btn-border-width {
+  /* border width */
   syntax: '<line-width>';
   inherits: false;
   initial-value: 4px;
 }
 
 @property --nes-btn-border-color {
+  /* border color */
   syntax: '<color>';
   inherits: false;
   initial-value: black;
 }
 
 @property --nes-btn-border-inset-color {
+  /* inset border color */
   syntax: '<color>';
   inherits: false;
   initial-value: gray;
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..e69de29
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..55ade60
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,30 @@
+{
+  "compilerOptions": {
+    /** Language and Environment */
+    "target": "ESNext",
+
+    /** Modules */
+    "rootDir": "./",
+    "module": "ESNext",
+    "moduleResolution": "Node",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+
+    /** Interop Constraints */
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+
+    /** Type Checking */
+    "strict": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedIndexedAccess": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noImplicitOverride": true,
+    "importsNotUsedAsValues": "error",
+    "allowSyntheticDefaultImports": true,
+  },
+  "exclude": [
+    "node_modules",
+  ]
+}