Injected frontmatter change

src/pages/en/guides/content-collections.mdx

@@ -390,9 +390,9 @@ const blogPosts = await getCollection('blog');
 })}
 ```
 
-### Access injected frontmatter from `render()`
+### Access modified frontmatter from `render()`
 
-Astro allows you to [inject frontmatter using remark or rehype plugins.](/en/guides/markdown-content/#example-injecting-frontmatter) You can access these values using the `injectedFrontmatter` property from `render()`:
+Astro allows you to [modify frontmatter using remark or rehype plugins](/en/guides/markdown-content/#modifying-frontmatter-programmatically). You can access this modified frontmatter using the `injectedFrontmatter` property from `render()`:
 
 ```astro "{ injectedFrontmatter }"
 ---
@@ -408,6 +408,10 @@ const blogPosts = await getCollection('blog');
 
 Assuming `readingTime` was injected ([see our reading time example](/en/guides/markdown-content/#example-calculate-reading-time)), it will be available on the `injectedFrontmatter` object.
 
+:::caution
+Remark and rehype plugins will have access to the _raw_ Markdown or MDX document frontmatter. This means frontmatter will not reflect any changes or defaults applied by your `schema`.
+:::
+
 <details>
 <summary>**🙋 Why don't `getCollection()` and `getEntry()` contain these values?**</summary>
 

src/pages/en/guides/markdown-content.mdx

@@ -482,7 +482,7 @@ export default {
 }
 ```
 
-#### Example: Injecting frontmatter
+### Modifying frontmatter programmatically
 
 You can add frontmatter properties to all of your Markdown and MDX files by using a [remark or rehype plugin](#markdown-plugins).
 
@@ -497,6 +497,12 @@ You can add frontmatter properties to all of your Markdown and MDX files by usin
     }
     ```
 
+    :::tip
+    <Since v="2.0.0" />
+
+    `data.astro.frontmatter` contains all properties from a given Markdown or MDX document. This allows you to modify existing frontmatter properties, or compute new properties based on other properties.
+    :::
+
 2. Apply this plugin to your `markdown`  or `mdx` integration config:
 
     ```js title="astro.config.mjs" "import { exampleRemarkPlugin } from './example-remark-plugin.mjs';" "remarkPlugins: [exampleRemarkPlugin],"

src/pages/en/reference/api-reference.mdx

@@ -830,7 +830,7 @@ A function to compile a given Markdown or MDX document for rendering. This retur
 
 - `<Content />` - A component used to render the document's contents in an Astro file.
 - `headings` - A generated list of headings, [mirroring Astro's `getHeadings()` utility](/en/guides/markdown-content/#exported-properties) on Markdown and MDX imports.
-- `injectedFrontmatter ` - An object of frontmatter [injected via remark or rehype plugins](/en/guides/markdown-content/#example-injecting-frontmatter). Set to type `any`.
+- `injectedFrontmatter ` - The [modified frontmatter object](/en/guides/markdown-content/#modifying-frontmatter-programmatically) applied via remark or rehype plugins. Set to type `any`.
 
 ```astro
 ---