diff --git a/report.tex b/report.tex
index 2310dc5..31c1532 100644
--- a/report.tex
+++ b/report.tex
@@ -697,6 +697,7 @@
 \end{aligned}
 $}
 \]
+  where all the second order spatial derivatives are highlighted in red.
   \end{frame}
 
   \begin{frame}{References}