diff --git a/README.md b/README.md
index 603b0b14fd527e7a6407c8e1bdda31981e48242b..276732ed73ef537ca17bbc72edcb2ddf935c93a7 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,10 @@
 * Radek Fučík and Robert Straka: <i>Equivalent finite difference and partial differential equations for the lattice Boltzmann method</i>, Elsevier Computers & Mathematics with Applications, vol. 90, 2021, 96-103 
  https://doi.org/10.1016/j.camwa.2021.03.014
 
+Electronic supplementary materials for the second paper (i.e., the output of this code) are placed in the root and named as supp_DdQq_pde.pdf.
+
+ ## License
+
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or