doc: add note regarding --experimental-detect-module

PR-URL: #51089
Fixes: #51057
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jacob Smith <jacob@frende.me>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

doc/api/packages.md

@@ -69,13 +69,14 @@ expressions:
 * Strings passed in as an argument to `--eval`, or piped to `node` via `STDIN`,
   with the flag `--input-type=module`.
 
-* Code that contains syntax that only parses successfully as [ES modules][],
-  such as `import` or `export` statements or `import.meta`, when the code has no
-  explicit marker of how it should be interpreted. Explicit markers are `.mjs`
-  or `.cjs` extensions, `package.json` `"type"` fields with either `"module"` or
-  `"commonjs"` values, or `--input-type` or `--experimental-default-type` flags.
-  Dynamic `import()` expressions are supported in either CommonJS or ES modules
-  and would not cause a file to be treated as an ES module.
+* When using [`--experimental-detect-module`][], code containing syntax only
+  successfully parsed as [ES modules][], such as `import` or `export`
+  statements or `import.meta`, having no explicit marker of how it should be
+  interpreted. Explicit markers are `.mjs` or `.cjs` extensions, `package.json`
+  `"type"` fields with either `"module"` or `"commonjs"` values, or
+  `--input-type` or `--experimental-default-type` flags. Dynamic `import()`
+  expressions are supported in either CommonJS or ES modules and would not
+  cause a file to be treated as an ES module.
 
 Node.js will treat the following as [CommonJS][] when passed to `node` as the
 initial input, or when referenced by `import` statements or `import()`
@@ -1362,6 +1363,7 @@ This field defines [subpath imports][] for the current package.
 [`"type"`]: #type
 [`--conditions` / `-C` flag]: #resolving-user-conditions
 [`--experimental-default-type`]: cli.md#--experimental-default-typetype
+[`--experimental-detect-module`]: cli.md#--experimental-detect-module
 [`--no-addons` flag]: cli.md#--no-addons
 [`ERR_PACKAGE_PATH_NOT_EXPORTED`]: errors.md#err_package_path_not_exported
 [`esm`]: https://github.com/standard-things/esm#readme