diff --git a/python-data/README.md b/python-data/README.md
index 90aebc4..7488726 100644
--- a/python-data/README.md
+++ b/python-data/README.md
@@ -9,9 +9,9 @@ In this folder you will find all the material used to run the course.
 
 Presentation material is used from the links listed below:
 
-1. [xarray: Introduction to multidimensional arrays](https://geohackweek.github.io/nDarrays/01-introduction/), [intro to xarray](https://geohackweek.github.io/nDarrays/02-xarray-architecture/) and [label-based indexing](https://geohackweek.github.io/nDarrays/03-label-based-indexing/).
-2. [xarray: Plotting](https://geohackweek.github.io/nDarrays/04-plotting/) and [aggregation](https://geohackweek.github.io/nDarrays/05-aggregation/)
-3. [xarray: Groupby processing](https://geohackweek.github.io/nDarrays/07-groupby-processing/) and [masking](https://geohackweek.github.io/nDarrays/09-masking/)
+1. xarray: [Introduction to multidimensional arrays](https://geohackweek.github.io/nDarrays/01-introduction/), [intro to xarray](https://geohackweek.github.io/nDarrays/02-xarray-architecture/) and [label-based indexing](https://geohackweek.github.io/nDarrays/03-label-based-indexing/).
+2. xarray: [Plotting](https://geohackweek.github.io/nDarrays/04-plotting/) and [aggregation](https://geohackweek.github.io/nDarrays/05-aggregation/)
+3. xarray: [Groupby processing](https://geohackweek.github.io/nDarrays/07-groupby-processing/) and [masking](https://geohackweek.github.io/nDarrays/09-masking/)
 4. [cf-python]()
 5. [matplotlib](https://matplotlib.org/stable/users/explain/quick_start.html)
 6. [numpy](https://numpy.org/devdocs/user/quickstart.html)