From 623e1fd16fb8310d15dd7668d537eab901402f0a Mon Sep 17 00:00:00 2001
From: Matt Wala <wala1@illinois.edu>
Date: Thu, 2 Feb 2017 14:23:23 -0600
Subject: [PATCH] Document symbolic backends.

---
 doc/misc.rst | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/doc/misc.rst b/doc/misc.rst
index c6ea75c3..c77c7c22 100644
--- a/doc/misc.rst
+++ b/doc/misc.rst
@@ -19,6 +19,19 @@ and say::
 
 In addition, you need to have :mod:`numpy` installed.
 
+Symbolic backends
+=================
+
+:mod:`sumpy` supports two symbolic backends: sympy and SymEngine. To use the
+SymEngine backend, ensure that the `SymEngine library
+<https://github.com/symengine/symengine>`_ and the `SymEngine Python bindings
+<https://github.com/symengine/symengine.py>`_ are installed.
+
+By default, :mod:`sumpy` prefers using SymEngine but falls back to sympy if it
+detects that SymEngine is not installed. To force the use of a particular
+backend, set the environment variable `SUMPY_FORCE_SYMBOLIC_BACKEND` to
+`symengine` or `sympy`.
+
 User-visible Changes
 ====================
 
-- 
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