diff --git a/doc/api/readline.md b/doc/api/readline.md
index 1acec195a3505e..4a8d8f20ac03c6 100644
--- a/doc/api/readline.md
+++ b/doc/api/readline.md
@@ -601,6 +601,7 @@ changes:
     **Default:** `500`.
   * `tabSize` {integer} The number of spaces a tab is equal to (minimum 1).
     **Default:** `8`.
+* Returns: {readline.Interface}
 
 The `readline.createInterface()` method creates a new `readline.Interface`
 instance.