Updated documentation.

docs/source/releasenotes/notes_0.4.2.rst

@@ -22,6 +22,8 @@ hand (mostly on the number of nuclides in the problem).
 New Features
 ------------
 
+- Option to not reduce tallies across processors at end of each batch.
+- Uniform fission site method for reducing variance on local tallies.
 - Reading/writing binary source files.
 - Added more messages for <trace> or high verbosity.
 - Estimator for diffusion coefficient.
@@ -35,11 +37,13 @@ New Features
 Bug Fixes
 ---------
 
-- `b2c40e`_: Fixed bug in incoming energy filter for track-length tallies.
-- `5524fd`_: Mesh filter now works with track-length tallies.
-- `d050c7`_: Added Bessel's correction to make estimate of variance unbiased.
-- `2a5b9c`_: Fixed regression in plotting.
+- 671f30_: Fixed surface currents on mesh not encompassing geometry.
+- b2c40e_: Fixed bug in incoming energy filter for track-length tallies.
+- 5524fd_: Mesh filter now works with track-length tallies.
+- d050c7_: Added Bessel's correction to make estimate of variance unbiased.
+- 2a5b9c_: Fixed regression in plotting.
 
+.. _671f30: https://github.com/mit-crpg/openmc/commit/671f30
 .. _b2c40e: https://github.com/mit-crpg/openmc/commit/b2c40e
 .. _5524fd: https://github.com/mit-crpg/openmc/commit/5524fd
 .. _d050c7: https://github.com/mit-crpg/openmc/commit/d050c7

docs/source/usersguide/input.rst

@@ -151,6 +151,19 @@ problem. It has the following attributes/sub-elements:
 
     *Default*: None
 
+``<no_reduce>`` Element
+-----------------------
+
+The ``<no_reduce>`` element has no attributes and has an accepted value of "on"
+or "off". If set to "on", all user-defined tallies and global tallies will not
+be reduced across processors in a parallel calculation. This means that the
+accumulate score in one batch on a single processor is considered as an
+independent realization for the tally random variable. For a problem with large
+tally data, this option can significantly improve the parallel efficiency.
+
+  *Default*: off
+
+
 ``<ptables>`` Element
 ---------------------
 
@@ -195,12 +208,14 @@ criticality calculations. It takes the following attributes:
 ``<survival_biasing>`` Element
 ------------------------------
 
-The ``<survival_biasing>`` element has no attributes and assumes wither the
-value ``on`` or ``off``. If turned on, this option will enable the use of
-survival biasing, otherwise known as implicit capture or absorption.
+The ``<survival_biasing>`` element has no attributes and has an accepted value
+of "on" or "off". If set to "on", this option will enable the use of survival
+biasing, otherwise known as implicit capture or absorption.
 
   *Default*: off
 
+.. _trace:
+
 ``<trace>`` Element
 -------------------
 
@@ -247,6 +262,15 @@ displayed. This element takes the following attributes:
 
     *Default*: 5
 
+``<write_source>`` Element
+------------------------------
+
+The ``<write_source>`` element has no attributes and has an accepted value of
+"on" or "off". If set to "on", a binary source file will be written to diskat
+the end of the run that can be used as a starting source for another run.
+
+  *Default*: off
+
 --------------------------------------
 Geometry Specification -- geometry.xml
 --------------------------------------

docs/source/usersguide/troubleshoot.rst

@@ -94,7 +94,7 @@ geometry has been specified incorrectly or is missing.
 
 The best way to debug this error is to turn on a trace for the particle getting
 lost. After the error message, the code will display what batch, generation, and
-particle number caused the error. In your settings.xml, add a <trace> tag
+particle number caused the error. In your settings.xml, add a :ref:`trace`
 followed by the batch, generation, and particle number. This will give you
 detailed output every time that particle enters a cell, crosses a boundary, or
 has a collision. For example, if you received this error at cycle 5, generation