Index: add_ons.txt
===================================================================
--- add_ons.txt	(revision 4537)
+++ add_ons.txt	(working copy)
@@ -130,6 +130,25 @@
 
 You can pass in either an integer or a string representation of an integer.
 
+naturalday
+----------
+
+Converts a date to natural string, if it's today, tomorrow or yesterday
+
+**Argument:** Date formatting string as described in default tag now_.
+
+.. _now: ../templates/#now
+
+Examples (when 'today' is 17 Feb 2007):
+
+    * ``16 Feb 2007`` becomes ``yesterday``.
+    * ``17 Feb 2007`` becomes ``today``.
+    * ``18 Feb 2007`` becomes ``tomorrow``.
+    * Any other day is formatted according to given argument or `DATE_FORMAT`_ if
+      argument is not given.
+
+.. _DATE_FORMAT: ../settings/#date_format
+
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