diff --git a/docs/ref/templates/builtins.txt b/docs/ref/templates/builtins.txt
index d34742f210..97bae1819d 100644
--- a/docs/ref/templates/builtins.txt
+++ b/docs/ref/templates/builtins.txt
@@ -2723,7 +2723,7 @@ Truncated strings will end with a translatable ellipsis character ("…").
 
 **Argument:** Number of characters to truncate to
 
-For example:
+For example in a template:
 
 .. code-block:: html+django
 
@@ -2731,6 +2731,20 @@ For example:
 
 If ``value`` is ``"Joel is a slug"``, the output will be ``"Joel i…"``.
 
+For example in Python:
+
+.. code-block:: python
+
+    from django.template.defaultfilters import truncatechars
+
+    truncated = truncatechars("Joel is a slug", 7)
+
+If ``value`` is ``"Joel is a slug"``, the output will be ``"Joel i…"``.
+
+.. function:: truncatechars(value, arg)
+
+    This function truncates a string after ``arg`` number of characters.
+
 .. templatefilter:: truncatechars_html
 
 ``truncatechars_html``