Clarify generated marker requires a config option
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1b9208d..5b23360 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -61,6 +61,7 @@
- New `One` variant added to `imports_granularity` configuration option which can be used to reformat all imports into a single use statement [#4669](https://github.com/rust-lang/rustfmt/issues/4669)
- rustfmt will now skip files that are annotated with `@generated` at the top of the file [#3958](https://github.com/rust-lang/rustfmt/issues/3958)
+ if `format_generated_files` option is set to `false` (by default `@generated` files are formatted)
- New configuration option `hex_literal_case` that allows user to control the casing utilized for hex literals [PR #4903](https://github.com/rust-lang/rustfmt/pull/4903)
See the section on the configuration site for more information
diff --git a/Configurations.md b/Configurations.md
index 4476f2a..2e2b0f7 100644
--- a/Configurations.md
+++ b/Configurations.md
@@ -930,6 +930,8 @@
Format generated files. A file is considered generated
if any of the first five lines contain a `@generated` comment marker.
+By default, generated files are reformatted, i. e. `@generated` marker is ignored.
+This option is currently ignored for stdin (`@generated` in stdin is ignored.)
- **Default value**: `true`
- **Possible values**: `true`, `false`
