diff --git a/docs/ref/models/queries.txt b/docs/ref/models/queries.txt
index 1eab21c..c01bc79 100644
--- a/docs/ref/models/queries.txt
+++ b/docs/ref/models/queries.txt
@@ -57,6 +57,18 @@ and describe the operation.
 
        reporter = Reporters.objects.get(pk=reporter.pk)
 
+.. note::
+
+    The ``F()`` is applied everytime the ``save()`` method gets called.  
+
+        reporter.stories_filed = F('stories_filed') + 1
+        reporter.save()
+        # other changes
+        reporter.save()
+
+    The above would cause ``reporter.stories_filed`` to be incrimented twice, 
+    once for each call to ``save()``
+
 As well as being used in operations on single instances as above, ``F()`` can
 be used on ``QuerySets`` of object instances, with ``update()``. This reduces
 the two queries we were using above - the ``get()`` and the