From 4e1046585f7277faf8b5de7c1c2bb3bfa0a10cba Mon Sep 17 00:00:00 2001
From: Qingming He <906459647@qq.com>
Date: Mon, 10 Oct 2016 22:46:18 -0400
Subject: [PATCH] add docs for <create_fission_neutrons>

---
 docs/source/usersguide/input.rst | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/docs/source/usersguide/input.rst b/docs/source/usersguide/input.rst
index 847dc66fff..4eb83d7033 100644
--- a/docs/source/usersguide/input.rst
+++ b/docs/source/usersguide/input.rst
@@ -872,6 +872,19 @@ displayed. This element takes the following attributes:
 
     *Default*: 5
 
+``<create_fission_neutrons>`` Element
+-------------------------------------
+
+The ``<create_fission_neutrons>`` element indicates whether fission neutrons
+should be created or not.  If this element is set to "true", fission neutrons
+will be created; otherwise the fission is treated as capture and no fission
+neutron will be created. Note that this option is only applied to fixed source
+calculation. For eigenvalue calculation, fission will always be treated as real
+fission.
+
+  *Default*: true
+
+
 ``<volume_calc>`` Element
 -------------------------