diff --git a/manual/customize.rst b/manual/customize.rst
index 59475e91f2..5dde2b226d 100644
--- a/manual/customize.rst
+++ b/manual/customize.rst
@@ -34,6 +34,8 @@ Environment variables
     * ``SYSFS_PATH`` - Use if sysfs is mounted somewhere other than /sys
     * ``http_proxy`` - Used on linux to specify an HTTP proxy
 
+See `How to set environment variables in windows <http://www.computerhope.com/issues/ch000549.htm>`_.
+
 Tweaks
 ------------