diff --git a/README.md b/README.md
index b28d7ac81bef70338268f5983ffbc1a42513646d..b23abdb9e4216527e193923c2c8787a0a105fff6 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ pip install numpy scipy==1.7.3
 pip install torch --index-url https://download.pytorch.org/whl/cpu
 
 # install dependencies for the analysis in the notebook
-pip install matplotlib lmfit seaborn
+pip install matplotlib lmfit seaborn extra_data
 
 # add it to the Jupyter Lab in Maxwell
 pip install ipykernel