diff --git a/requirements.txt b/requirements.txt
index 747b74982a9139c28fbc0b5f889574627c28cc03..c467343a554aaaf1d69452dd22a6daad5be32175 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,15 +2,17 @@ numpy
 matplotlib
 netcdf4
 xarray
-#zarr
+#zarr            # cannot easily be installed with pip
 pandas
 cmocean
 scipy
 ipdb
 ipywidgets
+ipykernel
 jupytext
+nbconvert
 pytest
 healpy
 cftime
-#cartopy
-#dask[complete]
+#cartopy         # cannot easily be installed with pip
+#dask[complete]  # cannot easily be installed with pip