From dad06b49fc35cb216aa1629fa6b5dde605608a95 Mon Sep 17 00:00:00 2001
From: Sterling Harper <sterlingmharper@gmail.com>
Date: Thu, 13 Nov 2014 03:55:16 -0500
Subject: [PATCH] Updated docs for cells with no surfaces

---
 docs/source/usersguide/input.rst | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/docs/source/usersguide/input.rst b/docs/source/usersguide/input.rst
index f7e70ef20..fe495b117 100644
--- a/docs/source/usersguide/input.rst
+++ b/docs/source/usersguide/input.rst
@@ -757,7 +757,10 @@ Each ``<cell>`` element can have the following attributes or sub-elements:
     is on the negative side of surface 3 and the positive side of surface 5, the
     bounding surfaces would be given as "-3 5".
 
-    *Default*: None
+    .. note:: The surface attribute/element can be omitted to make a cell fill
+              its entire universe.
+
+    *Default*: No surfaces
 
   :rotation:
     If the cell is filled with a universe, this element specifies the angles in