diff --git a/02_optimisation.md b/02_optimisation.md
index fe19250c9f9ca105982101367c134b4ce052bdf9..4c39bb7b8f7af1d8aeb4b38e679a782e510b9b10 100644
--- a/02_optimisation.md
+++ b/02_optimisation.md
@@ -736,7 +736,8 @@ On peut assez facilement se convaincre que si $\lambda$ est suffisamment petit,
peut se voir dans la @fig:gradient.
{#fig:gradient width=70%}
+<https://bit.ly/2Fhvn7p>](figs/Gradient_descent.svg){#fig:gradient
+width=70%}
---
diff --git a/figs/Gradient_descent.svg b/figs/Gradient_descent.svg
new file mode 100644
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