diff --git a/journal/Readme.md b/journal/Readme.md
index eec5440aa6c2363474daf152e5f39a9b13ca9842..9dffb3b0f9ba9ff553d846f986903f41536135e0 100644
--- a/journal/Readme.md
+++ b/journal/Readme.md
@@ -25,4 +25,7 @@ I don't know why I can't sign in when I am in the course Gitlab, so this are the
 - [Wikipedia Markdown entry](https://en.wikipedia.org/wiki/Markdown#Example)
 - [MOOC Markdown entry](https://lms.fun-mooc.fr/courses/course-v1:inria+41016+self-paced/courseware/2bfe60a86fed4994b5493a220c38eb69/13f6fd96266746a0bd9d717a12f1f835/)
 - [Jupyter Notebook useful tips (advanced)](https://www.dataquest.io/blog/jupyter-notebook-tips-tricks-shortcuts/)
-- [Numpy functions](https://numpy.org/doc/stable/reference/generated/numpy.amax.html)
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+- [Numpy functions](https://numpy.org/doc/stable/reference/generated/numpy.amax.html)
+    - When you want a continuous vector: `np.linspace` (not the case for Exercise 2)
+    - When you want a discrete vector (start, stop, step): `np.arange`
+- [Matplotlib memo](https://matplotlib.org/stable/api/pyplot_summary.html)
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