diff --git a/src/external/README.md b/src/external/README.md
index 4bc5d0005f52a4345b5b7fe58bf1d3980ca53897..5ef19dc3d73bc0fa91e9173635060d72d44208d1 100644
--- a/src/external/README.md
+++ b/src/external/README.md
@@ -1,11 +1,13 @@
 # Installing external libraries
 
-<pre><code>
-mkdir SOPHIA
-mkdir nr</code></pre>
-
 - download SOPHIA event generator sources from https://elsevier.digitalcommonsdata.com/datasets/pkx5j87mgn/1 and extract in **SOPHIA** folder
-- download Numerical Recipes 3rd ed. C++ source code to **nr** folder:
+- download Numerical Recipes 3rd ed. C++ source code to **nr** folder
+
 <pre><code>
+mkdir SOPHIA
+cd SOPHIA
+cp ~/Downloads/adlb_v1_0.tar.gz ./
+tar xfoz adlb_v1_0.tar.gz
+cd ..
 git clone https://github.com/blackstonep/Numerical-Recipes.git nr
 </code></pre>