diff --git a/doc/api/url.md b/doc/api/url.md
index d5dc06055b6c..bdc27144fa3a 100644
--- a/doc/api/url.md
+++ b/doc/api/url.md
@@ -1741,6 +1741,7 @@ changes:
 
 * `urlObject` {Object} A URL object (as returned by `url.parse()` or
   constructed otherwise).
+* Returns: {string}
 
 The `url.format()` method returns a formatted URL string derived from
 `urlObject`.
@@ -1836,6 +1837,7 @@ changes:
 
 * `urlString` {string} A string that will be passed to `url.parse()` and then
   formatted.
+* Returns: {string}
 
 `url.format(urlString)` is shorthand for `url.format(url.parse(urlString))`.