diff --git a/django/template/defaultfilters.py b/django/template/defaultfilters.py
index ae76910a37d..f82c08348a7 100644
--- a/django/template/defaultfilters.py
+++ b/django/template/defaultfilters.py
@@ -851,8 +851,8 @@ def filesizeformat(bytes_):
 @register.filter(is_safe=False)
 def pluralize(value, arg='s'):
     """
-    Return a plural suffix if the value is not 1. By default, use 's' as the
-    suffix:
+    Return a plural suffix if the value is not 1, '1', or an object of
+    length 1. By default, use 's' as the suffix:
 
     * If value is 0, vote{{ value|pluralize }} display "votes".
     * If value is 1, vote{{ value|pluralize }} display "vote".
diff --git a/docs/ref/templates/builtins.txt b/docs/ref/templates/builtins.txt
index cd5476fd6fa..b004f9b34f0 100644
--- a/docs/ref/templates/builtins.txt
+++ b/docs/ref/templates/builtins.txt
@@ -1990,8 +1990,8 @@ If ``value`` is ``800-COLLECT``, the output will be ``800-2655328``.
 ``pluralize``
 -------------
 
-Returns a plural suffix if the value is not 1. By default, this suffix is
-``'s'``.
+Returns a plural suffix if the value is not ``1``, ``'1'``, or an object of
+length 1. By default, this suffix is ``'s'``.
 
 Example::