diff --git a/doc/api/os.md b/doc/api/os.md
index bfe20c1bef5c7f..15b84189c91272 100644
--- a/doc/api/os.md
+++ b/doc/api/os.md
@@ -26,6 +26,8 @@ A string constant defining the operating system-specific end-of-line marker:
 added: v0.5.0
 -->
 
+* Returns: {String}
+
 The `os.arch()` method returns a string identifying the operating system CPU
 architecture *for which the Node.js binary was compiled*.
 
@@ -36,6 +38,9 @@ The current possible values are: `'arm'`, `'arm64'`, `'ia32'`, `'mips'`,
 Equivalent to [`process.arch`][].
 
 ## os.constants
+<!-- YAML
+added: v6.3.0
+-->
 
 * {Object}