From fb32f55b4f88bc08c98f02278cf40d1927da0073 Mon Sep 17 00:00:00 2001
From: Matt Wala <wala1@illinois.edu>
Date: Tue, 7 Nov 2017 19:57:06 -0600
Subject: [PATCH] Document environment variables

---
 doc/misc.rst | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/doc/misc.rst b/doc/misc.rst
index c77c7c22..113427ed 100644
--- a/doc/misc.rst
+++ b/doc/misc.rst
@@ -19,8 +19,25 @@ and say::
 
 In addition, you need to have :mod:`numpy` installed.
 
+Usage
+=====
+
+Environment variables
+---------------------
+
++-----------------------------------+-----------------------------------------------------+
+| Name                              | Purpose                                             |
++===================================+=====================================================+
+| `SUMPY_FORCE_SYMBOLIC_BACKEND`    | Symbolic backend control, see `Symbolic backends`_  |
++-----------------------------------+-----------------------------------------------------+
+| `SUMPY_NO_CACHE`                  | If set, disables the on-disk cache                  |
++-----------------------------------+-----------------------------------------------------+
+| `SUMPY_NO_OPT`                    | If set, disables performance-oriented :mod:`loopy`  |
+|                                   | transformations                                     |
++-----------------------------------+-----------------------------------------------------+
+
 Symbolic backends
-=================
+-----------------
 
 :mod:`sumpy` supports two symbolic backends: sympy and SymEngine. To use the
 SymEngine backend, ensure that the `SymEngine library
-- 
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