diff --git a/doc/api/querystring.md b/doc/api/querystring.md
index c3ee69c6a8e224..9ec11ac9025ba3 100644
--- a/doc/api/querystring.md
+++ b/doc/api/querystring.md
@@ -101,6 +101,10 @@ added: v0.1.25
 The `querystring.stringify()` method produces a URL query string from a
 given `obj` by iterating through the object's "own properties".
 
+It serializes the following types of values passed in `obj`:
+{String|Number|Boolean|String[]|Number[]|Boolean[]}
+Any other input values will be coerced to empty strings.
+
 For example:
 
 ```js