Quick-n-dirty addition of node environments

Signed-off-by: martin f. krafft <madduck@madduck.net>
diff --git a/doc/source/salt.rst b/doc/source/salt.rst
index 25bd53f..f0cc733 100644
--- a/doc/source/salt.rst
+++ b/doc/source/salt.rst
@@ -163,6 +163,7 @@
 classes           (none) [#nodegroups]_
 applications      states
 parameters        pillar
+environment       environment
 ================= ================
 
 .. [#nodegroups] See `Salt issue #5787`_ for steps into the direction of letting