diff --git a/examples/with-markdoc/src/content/blog/with-mdx.mdx b/examples/with-markdoc/src/content/blog/with-mdx.mdx
new file mode 100644
index 000000000..d3c9d0169
--- /dev/null
+++ b/examples/with-markdoc/src/content/blog/with-mdx.mdx
@@ -0,0 +1,5 @@
+---
+title: 'Example!'
+---
+
+# With MDX {frontmatter.title}
diff --git a/examples/with-markdoc/src/pages/index.astro b/examples/with-markdoc/src/pages/index.astro
index 4e7f63365..5b8b67a9a 100644
--- a/examples/with-markdoc/src/pages/index.astro
+++ b/examples/with-markdoc/src/pages/index.astro
@@ -5,9 +5,11 @@ import Marquee from '../components/Marquee.astro';
 import { getEntryBySlug } from 'astro:content';
 import RedP from '../components/RedP.astro';
 
-const testEntry = await getEntryBySlug('blog', 'test');
-console.log(testEntry);
-const { Content } = await testEntry.render();
+const mdocEntry = await getEntryBySlug('blog', 'test');
+const mdxEntry = await getEntryBySlug('blog', 'with-mdx');
+console.log(mdocEntry);
+const { Content } = await mdocEntry.render();
+const { Content: MDXContent } = await mdxEntry.render();
 ---
 
 <html lang="en">
@@ -21,6 +23,7 @@ const { Content } = await testEntry.render();
 	<body>
 		<h1>Astro</h1>
 		<article>
+			<MDXContent />
 			<Content
 				components={{
 					marquee: Marquee,
diff --git a/packages/astro/src/content/consts.ts b/packages/astro/src/content/consts.ts
index 472ca0d88..c034a2fdb 100644
--- a/packages/astro/src/content/consts.ts
+++ b/packages/astro/src/content/consts.ts
@@ -1,4 +1,4 @@
-export const defaultContentEntryExts = ['.md', '.mdx'] as const;
+export const defaultContentEntryExts = ['.md'] as const;
 export const PROPAGATED_ASSET_FLAG = 'astroPropagatedAssets';
 export const CONTENT_FLAG = 'astroContent';
 export const VIRTUAL_MODULE_ID = 'astro:content';
diff --git a/packages/integrations/mdx/src/index.ts b/packages/integrations/mdx/src/index.ts
index 901ffb6bd..8906699bf 100644
--- a/packages/integrations/mdx/src/index.ts
+++ b/packages/integrations/mdx/src/index.ts
@@ -6,6 +6,7 @@ import mdxPlugin, { Options as MdxRollupPluginOptions } from '@mdx-js/rollup';
 import type { AstroIntegration } from 'astro';
 import { parse as parseESM } from 'es-module-lexer';
 import fs from 'node:fs/promises';
+import { fileURLToPath } from 'node:url';
 import type { Options as RemarkRehypeOptions } from 'remark-rehype';
 import { VFile } from 'vfile';
 import type { Plugin as VitePlugin } from 'vite';
@@ -22,12 +23,33 @@ export type MdxOptions = Omit<typeof markdownConfigDefaults, 'remarkPlugins' | '
 	remarkRehype: RemarkRehypeOptions;
 };
 
+const contentEntryType = {
+	extensions: ['.mdx'],
+	async getEntryInfo({ fileUrl }: { fileUrl: URL }) {
+		const rawContents = await fs.readFile(fileUrl, 'utf-8');
+		const parsed = parseFrontmatter(rawContents, fileURLToPath(fileUrl));
+		return {
+			data: parsed.data,
+			body: parsed.content,
+			slug: parsed.data.slug,
+			rawData: parsed.matter,
+		};
+	},
+};
+
 export default function mdx(partialMdxOptions: Partial<MdxOptions> = {}): AstroIntegration {
 	return {
 		name: '@astrojs/mdx',
 		hooks: {
-			'astro:config:setup': async ({ updateConfig, config, addPageExtension, command }: any) => {
+			'astro:config:setup': async ({
+				updateConfig,
+				config,
+				addPageExtension,
+				addContentEntryType,
+				command,
+			}: any) => {
 				addPageExtension('.mdx');
+				addContentEntryType(contentEntryType);
 
 				const extendMarkdownConfig =
 					partialMdxOptions.extendMarkdownConfig ?? defaultOptions.extendMarkdownConfig;
