diff --git a/bun.lock b/bun.lock
index bb6a4c4..32d84ef 100644
--- a/bun.lock
+++ b/bun.lock
@@ -10,6 +10,7 @@
         "rehype-raw": "^7.0.0",
         "rehype-slug": "^6.0.0",
         "rehype-stringify": "^10.0.1",
+        "remark-custom-heading-id": "^2.0.0",
         "remark-gfm": "^4.0.1",
         "remark-parse": "^11.0.0",
         "remark-rehype": "^11.1.2",
@@ -120,6 +121,8 @@
 
     "markdown-table": ["markdown-table@3.0.4", "", {}, "sha512-wiYz4+JrLyb/DqW2hkFJxP7Vd7JuTDm77fvbM8VfEQdmSMqcImWeeRbHwZjBjIFki/VaMK2BhFi7oUUZeM5bqw=="],
 
+    "mdast-heading-id": ["mdast-heading-id@2.0.0", "", {}, "sha512-JVh0xKqsI3INPzJEqqCiuq3BGde5x6AlBTQAetLQQr9qTiDjX4dCvFhIiGmyPt1rftiHELQPI5obGphIOTXeWQ=="],
+
     "mdast-util-find-and-replace": ["mdast-util-find-and-replace@3.0.2", "", { "dependencies": { "@types/mdast": "^4.0.0", "escape-string-regexp": "^5.0.0", "unist-util-is": "^6.0.0", "unist-util-visit-parents": "^6.0.0" } }, "sha512-Tmd1Vg/m3Xz43afeNxDIhWRtFZgM2VLyaf4vSTYwudTyeuTneoL3qtWMA5jeLyz/O1vDJmmV4QuScFCA2tBPwg=="],
 
     "mdast-util-from-markdown": ["mdast-util-from-markdown@2.0.2", "", { "dependencies": { "@types/mdast": "^4.0.0", "@types/unist": "^3.0.0", "decode-named-character-reference": "^1.0.0", "devlop": "^1.0.0", "mdast-util-to-string": "^4.0.0", "micromark": "^4.0.0", "micromark-util-decode-numeric-character-reference": "^2.0.0", "micromark-util-decode-string": "^2.0.0", "micromark-util-normalize-identifier": "^2.0.0", "micromark-util-symbol": "^2.0.0", "micromark-util-types": "^2.0.0", "unist-util-stringify-position": "^4.0.0" } }, "sha512-uZhTV/8NBuw0WHkPTrCqDOl0zVe1BIng5ZtHoDk49ME1qqcjYmmLmOf0gELgcRMxN4w2iuIeVso5/6QymSrgmA=="],
@@ -172,6 +175,8 @@
 
     "micromark-factory-whitespace": ["micromark-factory-whitespace@2.0.1", "", { "dependencies": { "micromark-factory-space": "^2.0.0", "micromark-util-character": "^2.0.0", "micromark-util-symbol": "^2.0.0", "micromark-util-types": "^2.0.0" } }, "sha512-Ob0nuZ3PKt/n0hORHyvoD9uZhr+Za8sFoP+OnMcnWK5lngSzALgQYKMr9RJVOWLqQYuyn6ulqGWSXdwf6F80lQ=="],
 
+    "micromark-heading-id": ["micromark-heading-id@2.0.0", "", { "dependencies": { "micromark-util-symbol": "^2.0.0" } }, "sha512-TdR5WCmwuCroK8QrfX0/4w9bjj3ayN0GzatxGV/lWQKmM75kNKVZEmdvKZS4MOskARxWXu1WHdIJjMSVMBegow=="],
+
     "micromark-util-character": ["micromark-util-character@2.1.1", "", { "dependencies": { "micromark-util-symbol": "^2.0.0", "micromark-util-types": "^2.0.0" } }, "sha512-wv8tdUTJ3thSFFFJKtpYKOYiGP2+v96Hvk4Tu8KpCAsTMs6yi+nVmGh1syvSCsaxz45J6Jbw+9DD6g97+NV67Q=="],
 
     "micromark-util-chunked": ["micromark-util-chunked@2.0.1", "", { "dependencies": { "micromark-util-symbol": "^2.0.0" } }, "sha512-QUNFEOPELfmvv+4xiNg2sRYeS/P84pTW0TCgP5zc9FpXetHY0ab7SxKyAQCNCc1eK0459uoLI1y5oO5Vc1dbhA=="],
@@ -214,6 +219,8 @@
 
     "rehype-stringify": ["rehype-stringify@10.0.1", "", { "dependencies": { "@types/hast": "^3.0.0", "hast-util-to-html": "^9.0.0", "unified": "^11.0.0" } }, "sha512-k9ecfXHmIPuFVI61B9DeLPN0qFHfawM6RsuX48hoqlaKSF61RskNjSm1lI8PhBEM0MRdLxVVm4WmTqJQccH9mA=="],
 
+    "remark-custom-heading-id": ["remark-custom-heading-id@2.0.0", "", { "dependencies": { "mdast-heading-id": "*", "micromark-heading-id": "*", "unist-util-visit": "^5.0.0" } }, "sha512-LpR+c4pmuBGG/zhNbebecDnpKyXU4B7bdNu6tXW83T3QWlkwUpHYyUR8uXQ/BERK9HlI5pXGLu7DjkIS07/iVQ=="],
+
     "remark-gfm": ["remark-gfm@4.0.1", "", { "dependencies": { "@types/mdast": "^4.0.0", "mdast-util-gfm": "^3.0.0", "micromark-extension-gfm": "^3.0.0", "remark-parse": "^11.0.0", "remark-stringify": "^11.0.0", "unified": "^11.0.0" } }, "sha512-1quofZ2RQ9EWdeN34S79+KExV1764+wCUGop5CPL1WGdD0ocPpu91lzPGbwWMECpEpd42kJGQwzRfyov9j4yNg=="],
 
     "remark-parse": ["remark-parse@11.0.0", "", { "dependencies": { "@types/mdast": "^4.0.0", "mdast-util-from-markdown": "^2.0.0", "micromark-util-types": "^2.0.0", "unified": "^11.0.0" } }, "sha512-FCxlKLNGknS5ba/1lmpYijMUzX2esxW5xQqjWxw2eHFfS2MSdaHVINFmhjo+qN1WhZhNimq0dZATN9pH0IDrpA=="],
diff --git a/demo/index.md b/demo/index.md
index 5830805..1cbb734 100644
--- a/demo/index.md
+++ b/demo/index.md
@@ -17,7 +17,7 @@ Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapi
 
 Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos.
 
-## Another section
+## Another section {#customid}
 
 Tables should be a thing too
 
diff --git a/package.json b/package.json
index 68ed5b8..2d67dd2 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "module": "index.ts",
   "type": "module",
   "private": true,
-  "version": "0.3.0",
+  "version": "0.3.1",
   "devDependencies": {
     "@types/bun": "latest"
   },
@@ -17,6 +17,7 @@
     "rehype-raw": "^7.0.0",
     "rehype-slug": "^6.0.0",
     "rehype-stringify": "^10.0.1",
+    "remark-custom-heading-id": "^2.0.0",
     "remark-gfm": "^4.0.1",
     "remark-parse": "^11.0.0",
     "remark-rehype": "^11.1.2",
diff --git a/src/markdown.ts b/src/markdown.ts
index e03dd76..8d497e2 100644
--- a/src/markdown.ts
+++ b/src/markdown.ts
@@ -6,11 +6,13 @@ import remarkRehype from "remark-rehype";
 import rehypeSlug from "rehype-slug";
 import { unified } from "unified";
 import rehypeCallouts from "rehype-callouts";
+import { remarkHeadingId } from "remark-custom-heading-id";
 
 export async function parseMarkdown(markdown: string): Promise<string> {
   const file = await unified()
     .use(remarkParse)
     .use(remarkGfm)
+    .use(remarkHeadingId)
     .use(remarkRehype, { allowDangerousHtml: true })
     .use(rehypeRaw)
     .use(rehypeSlug)