diff --git a/docs/ref/forms/fields.txt b/docs/ref/forms/fields.txt
index 2ebed3559b..6954e3819d 100644
--- a/docs/ref/forms/fields.txt
+++ b/docs/ref/forms/fields.txt
@@ -465,7 +465,7 @@ For each field, we describe the default widget used if you don't specify
 
     .. attribute:: input_formats
 
-        A list of formats used to attempt to convert a string to a valid
+        An iterable of formats used to attempt to convert a string to a valid
         ``datetime.date`` object.
 
     If no ``input_formats`` argument is provided, the default input formats are
@@ -490,7 +490,7 @@ For each field, we describe the default widget used if you don't specify
 
     .. attribute:: input_formats
 
-        A list of formats used to attempt to convert a string to a valid
+        An iterable of formats used to attempt to convert a string to a valid
         ``datetime.datetime`` object, in addition to ISO 8601 formats.
 
     The field always accepts strings in ISO 8601 formatted dates or similar
@@ -998,7 +998,7 @@ For each field, we describe the default widget used if you don't specify
 
     .. attribute:: input_formats
 
-        A list of formats used to attempt to convert a string to a valid
+        An iterable of formats used to attempt to convert a string to a valid
         ``datetime.time`` object.
 
     If no ``input_formats`` argument is provided, the default input formats are