diff --git a/pep-0557.rst b/pep-0557.rst
index 89235a261..5cfed73b2 100644
--- a/pep-0557.rst
+++ b/pep-0557.rst
@@ -528,7 +528,7 @@ mutable types as default values for fields::
 Module level helper functions
 -----------------------------
 
-- ``fields(class_or_instance)``: Returns a list of ``Field`` objects
+- ``fields(class_or_instance)``: Returns a tuple of ``Field`` objects
   that define the fields for this Data Class.  Accepts either a Data
   Class, or an instance of a Data Class.  Raises `ValueError` if not
   passed a Data Class or instance of one.  Does not return