diff --git a/1_understanding_a_computer.Rmd b/1_understanding_a_computer.Rmd
index d011e3f569b1c6b300b3055fb7359f86fbb42da1..c85d120baebcbd380c83a3cec2c06b200cb0f20d 100644
--- a/1_understanding_a_computer.Rmd
+++ b/1_understanding_a_computer.Rmd
@@ -160,5 +160,7 @@ You can find a [list of software licenses](https://www.gnu.org/licenses/license-
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+See this [presentation](https://plmlab.math.cnrs.fr/gdurif/presentation_foss/-/blob/main/presentation/presentation_DURIF_foss.pdf) (in french) for a quick introduction about **software licence** and **free/open source softare**.
+
 
 [Instead of installing GNU/Linux on your computer, you are going to learn to use the IFB Cloud.](./2_using_the_ifb_cloud.html)