diff --git a/README.md b/README.md
index 02e5497..b928abc 100644
--- a/README.md
+++ b/README.md
@@ -146,8 +146,8 @@ See [action.yml](action.yml)
 
 ### Outputs
 
-- `bundle-path` - The file path of JSON-serialized [Sigstore bundle][5] containing the attestation
-  and related verification material.
+- `bundle-path` - The file path of JSON-serialized [Sigstore bundle][5] containing
+  the attestation and related verification material.
 
 ## Sample Workflows
 
diff --git a/package-lock.json b/package-lock.json
index 59526f2..8bc256e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,6 +24,7 @@
         "eslint-plugin-jsonc": "^2.13.0",
         "eslint-plugin-prettier": "^5.1.3",
         "jest": "^29.7.0",
+        "markdownlint-cli": "^0.39.0",
         "prettier": "^3.2.5",
         "prettier-eslint": "^16.3.0",
         "ts-jest": "^29.1.2",
@@ -2761,6 +2762,15 @@
       "version": "1.1.4",
       "license": "MIT"
     },
+    "node_modules/commander": {
+      "version": "11.1.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-11.1.0.tgz",
+      "integrity": "sha512-yPVavfyCcRhmorC7rWlkHn15b4wDVgVmBA7kV4QVBsF7kv/9TKJAbAXVTxvTnwP8HHKjRCJDClKbciiYS7p0DQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=16"
+      }
+    },
     "node_modules/common-tags": {
       "version": "1.8.2",
       "dev": true,
@@ -2844,6 +2854,15 @@
         }
       }
     },
+    "node_modules/deep-extend": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
+      "integrity": "sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA==",
+      "dev": true,
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
     "node_modules/deep-is": {
       "version": "0.1.4",
       "dev": true,
@@ -2959,6 +2978,18 @@
         "iconv-lite": "^0.6.2"
       }
     },
+    "node_modules/entities": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-4.5.0.tgz",
+      "integrity": "sha512-V0hjH4dGPh9Ao5p0MoRY6BVqtwCjhz6vI5LT8AJ55H+4g9/4vbHx1I54fS0XuclLhDHArPQCiMjDxjaL8fPxhw==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.12"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
     "node_modules/err-code": {
       "version": "2.0.3",
       "license": "MIT"
@@ -4065,6 +4096,18 @@
         "node": ">=8.0.0"
       }
     },
+    "node_modules/get-stdin": {
+      "version": "9.0.0",
+      "resolved": "https://registry.npmjs.org/get-stdin/-/get-stdin-9.0.0.tgz",
+      "integrity": "sha512-dVKBjfWisLAicarI2Sf+JuBE/DghV4UzNAVe9yhEJuzeREd3JhOTE9cUaJTeSa77fsbQUK3pcOpJfM59+VKZaA==",
+      "dev": true,
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/get-stream": {
       "version": "6.0.1",
       "dev": true,
@@ -4333,9 +4376,10 @@
       }
     },
     "node_modules/ignore": {
-      "version": "5.2.4",
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.3.1.tgz",
+      "integrity": "sha512-5Fytz/IraMjqpwfd34ke28PTVMjZjJG2MPn5t7OE4eUCUNf8BAa7b5WUS9/Qvr6mwOQS7Mk6vdsMno5he+T8Xw==",
       "dev": true,
-      "license": "MIT",
       "engines": {
         "node": ">= 4"
       }
@@ -4401,6 +4445,15 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/ini": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ini/-/ini-4.1.1.tgz",
+      "integrity": "sha512-QQnnxNyfvmHFIsj7gkPcYymR8Jdw/o7mp5ZFihxn6h8Ci6fh3Dx4E1gPjpQEpIuPo9XVNY/ZUwh4BPMjGyL01g==",
+      "dev": true,
+      "engines": {
+        "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
+      }
+    },
     "node_modules/internal-slot": {
       "version": "1.0.5",
       "dev": true,
@@ -5370,6 +5423,12 @@
         "url": "https://github.com/sponsors/ota-meshi"
       }
     },
+    "node_modules/jsonc-parser": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/jsonc-parser/-/jsonc-parser-3.2.1.tgz",
+      "integrity": "sha512-AilxAyFOAcK5wA1+LeaySVBrHsGQvUFCDWXKpZjzaL0PqW+xfBOttn8GNtWKFWqneyMZj41MWF9Kl6iPWLwgOA==",
+      "dev": true
+    },
     "node_modules/jsx-ast-utils": {
       "version": "3.3.5",
       "dev": true,
@@ -5438,6 +5497,15 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/linkify-it": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/linkify-it/-/linkify-it-5.0.0.tgz",
+      "integrity": "sha512-5aHCbzQRADcdP+ATqnDuhhJ/MRIqDkZX5pyjFHRRysS8vZ5AbqGEoFIb6pYHPZ+L/OC2Lc+xT8uHVVR5CAK/wQ==",
+      "dev": true,
+      "dependencies": {
+        "uc.micro": "^2.0.0"
+      }
+    },
     "node_modules/locate-path": {
       "version": "6.0.0",
       "dev": true,
@@ -5621,6 +5689,126 @@
         "tmpl": "1.0.5"
       }
     },
+    "node_modules/markdown-it": {
+      "version": "14.0.0",
+      "resolved": "https://registry.npmjs.org/markdown-it/-/markdown-it-14.0.0.tgz",
+      "integrity": "sha512-seFjF0FIcPt4P9U39Bq1JYblX0KZCjDLFFQPHpL5AzHpqPEKtosxmdq/LTVZnjfH7tjt9BxStm+wXcDBNuYmzw==",
+      "dev": true,
+      "dependencies": {
+        "argparse": "^2.0.1",
+        "entities": "^4.4.0",
+        "linkify-it": "^5.0.0",
+        "mdurl": "^2.0.0",
+        "punycode.js": "^2.3.1",
+        "uc.micro": "^2.0.0"
+      },
+      "bin": {
+        "markdown-it": "bin/markdown-it.mjs"
+      }
+    },
+    "node_modules/markdownlint": {
+      "version": "0.33.0",
+      "resolved": "https://registry.npmjs.org/markdownlint/-/markdownlint-0.33.0.tgz",
+      "integrity": "sha512-4lbtT14A3m0LPX1WS/3d1m7Blg+ZwiLq36WvjQqFGsX3Gik99NV+VXp/PW3n+Q62xyPdbvGOCfjPqjW+/SKMig==",
+      "dev": true,
+      "dependencies": {
+        "markdown-it": "14.0.0",
+        "markdownlint-micromark": "0.1.8"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/DavidAnson"
+      }
+    },
+    "node_modules/markdownlint-cli": {
+      "version": "0.39.0",
+      "resolved": "https://registry.npmjs.org/markdownlint-cli/-/markdownlint-cli-0.39.0.tgz",
+      "integrity": "sha512-ZuFN7Xpsbn1Nbp0YYkeLOfXOMOfLQBik2lKRy8pVI/llmKQ2uW7x+8k5OMgF6o7XCsTDSYC/OOmeJ+3qplvnJQ==",
+      "dev": true,
+      "dependencies": {
+        "commander": "~11.1.0",
+        "get-stdin": "~9.0.0",
+        "glob": "~10.3.10",
+        "ignore": "~5.3.0",
+        "js-yaml": "^4.1.0",
+        "jsonc-parser": "~3.2.1",
+        "markdownlint": "~0.33.0",
+        "minimatch": "~9.0.3",
+        "run-con": "~1.3.2"
+      },
+      "bin": {
+        "markdownlint": "markdownlint.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/markdownlint-cli/node_modules/brace-expansion": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
+      "integrity": "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==",
+      "dev": true,
+      "dependencies": {
+        "balanced-match": "^1.0.0"
+      }
+    },
+    "node_modules/markdownlint-cli/node_modules/glob": {
+      "version": "10.3.10",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-10.3.10.tgz",
+      "integrity": "sha512-fa46+tv1Ak0UPK1TOy/pZrIybNNt4HCv7SDzwyfiOZkvZLEbjsZkJBPtDHVshZjbecAoAGSC20MjLDG/qr679g==",
+      "dev": true,
+      "dependencies": {
+        "foreground-child": "^3.1.0",
+        "jackspeak": "^2.3.5",
+        "minimatch": "^9.0.1",
+        "minipass": "^5.0.0 || ^6.0.2 || ^7.0.0",
+        "path-scurry": "^1.10.1"
+      },
+      "bin": {
+        "glob": "dist/esm/bin.mjs"
+      },
+      "engines": {
+        "node": ">=16 || 14 >=14.17"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
+    "node_modules/markdownlint-cli/node_modules/minimatch": {
+      "version": "9.0.3",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.3.tgz",
+      "integrity": "sha512-RHiac9mvaRw0x3AYRgDC1CxAP7HTcNrrECeA8YYJeWnpo+2Q5CegtZjaotWTWxDG3UeGA1coE05iH1mPjT/2mg==",
+      "dev": true,
+      "dependencies": {
+        "brace-expansion": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=16 || 14 >=14.17"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
+    "node_modules/markdownlint-micromark": {
+      "version": "0.1.8",
+      "resolved": "https://registry.npmjs.org/markdownlint-micromark/-/markdownlint-micromark-0.1.8.tgz",
+      "integrity": "sha512-1ouYkMRo9/6gou9gObuMDnvZM8jC/ly3QCFQyoSPCS2XV1ZClU0xpKbL1Ar3bWWRT1RnBZkWUEiNKrI2CwiBQA==",
+      "dev": true,
+      "engines": {
+        "node": ">=16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/DavidAnson"
+      }
+    },
+    "node_modules/mdurl": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/mdurl/-/mdurl-2.0.0.tgz",
+      "integrity": "sha512-Lf+9+2r+Tdp5wXDXC4PcIBjTDtq4UKjCPMQhKIuzpJNW0b96kVqSwW0bT7FhRSfmAiFYgP+SCRvdrDozfh0U5w==",
+      "dev": true
+    },
     "node_modules/merge-stream": {
       "version": "2.0.0",
       "dev": true,
@@ -6322,6 +6510,15 @@
         "node": ">=6"
       }
     },
+    "node_modules/punycode.js": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/punycode.js/-/punycode.js-2.3.1.tgz",
+      "integrity": "sha512-uxFIHU0YlHYhDQtV4R9J6a52SLx28BCjT+4ieh7IGbgwVJWO+km431c4yRlREUAsAmt/uMjQUyQHNEPf0M39CA==",
+      "dev": true,
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/pure-rand": {
       "version": "6.0.3",
       "dev": true,
@@ -6476,6 +6673,21 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/run-con": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/run-con/-/run-con-1.3.2.tgz",
+      "integrity": "sha512-CcfE+mYiTcKEzg0IqS08+efdnH0oJ3zV0wSUFBNrMHMuxCtXvBCLzCJHatwuXDcu/RlhjTziTo/a1ruQik6/Yg==",
+      "dev": true,
+      "dependencies": {
+        "deep-extend": "^0.6.0",
+        "ini": "~4.1.0",
+        "minimist": "^1.2.8",
+        "strip-json-comments": "~3.1.1"
+      },
+      "bin": {
+        "run-con": "cli.js"
+      }
+    },
     "node_modules/run-parallel": {
       "version": "1.2.0",
       "dev": true,
@@ -7177,6 +7389,12 @@
         "node": ">=14.17"
       }
     },
+    "node_modules/uc.micro": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/uc.micro/-/uc.micro-2.0.0.tgz",
+      "integrity": "sha512-DffL94LsNOccVn4hyfRe5rdKa273swqeA5DJpMOeFmEn1wCDc7nAbbB0gXlgBCL7TNzeTv6G7XVWzan7iJtfig==",
+      "dev": true
+    },
     "node_modules/unbox-primitive": {
       "version": "1.0.2",
       "dev": true,
diff --git a/package.json b/package.json
index c0799bd..1d74d7d 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,9 @@
     "ci-test": "jest",
     "format:write": "prettier --write **/*.ts",
     "format:check": "prettier --check **/*.ts",
-    "lint": "npx eslint . -c ./.github/linters/.eslintrc.yml",
+    "lint:eslint": "npx eslint . -c ./.github/linters/.eslintrc.yml",
+    "lint:markdown": "npx markdownlint --config .github/linters/.markdown-lint.yml \"*.md\"",
+    "lint": "npm run lint:eslint && npm run lint:markdown", 
     "package": "ncc build src/index.ts --license licenses.txt",
     "package:watch": "npm run package -- --watch",
     "test": "jest",
@@ -80,6 +82,7 @@
     "eslint-plugin-jsonc": "^2.13.0",
     "eslint-plugin-prettier": "^5.1.3",
     "jest": "^29.7.0",
+    "markdownlint-cli": "^0.39.0",
     "prettier": "^3.2.5",
     "prettier-eslint": "^16.3.0",
     "ts-jest": "^29.1.2",