--- /dev/null
+``abs``
+=======
+
+The ``abs`` filter returns the absolute value.
+
+.. code-block:: jinja
+
+ {# number = -5 #}
+
+ {{ number|abs }}
+
+ {# outputs 5 #}
+
+.. note::
+
+ Internally, Twig uses the PHP `abs`_ function.
+
+.. _`abs`: http://php.net/abs