From 62ba0dddb6ece3c61c645fa352c94685aa7e314b Mon Sep 17 00:00:00 2001
From: Pauli Virtanen <pauli.t.virtanen@jyu.fi>
Date: Thu, 8 Sep 2022 16:30:27 +0300
Subject: [PATCH] DOC

---
 doc/discretization.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/doc/discretization.md b/doc/discretization.md
index 6b1f96d..cee8b0d 100644
--- a/doc/discretization.md
+++ b/doc/discretization.md
@@ -194,6 +194,13 @@ We can also calculate the matrix current $`j\mapsto{}i`$ between neighboring cel
     U_{ij}
     +
     T^a U_{ij}\xi
+    \,,
+    \;
+    U_{ji}
+    \mapsto
+    U_{ji}
+    -
+    U_{ji} T^a \xi
   ]\rvert_{\xi=0}
 ```
 where $`T^a`$ is an appropriate matrix generator, and the transformation
-- 
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