diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
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-[![DOI](https://zenodo.org/badge/133041124.svg)](https://zenodo.org/badge/latestdoi/133041124)
-
 ## CP2K Scanning Probe Microscopy tools
 
+[![DOI](https://zenodo.org/badge/133041124.svg)](https://zenodo.org/badge/latestdoi/133041124)
+[![PyPI - Version](https://img.shields.io/pypi/v/cp2k-spm-tools?color=4CC61E)](https://pypi.org/project/cp2k-spm-tools/)
+
 Library and scripts to perform scanning probe microscopy simulations based on a [CP2K](https://www.cp2k.org/) calculation.
 
 Features include:
@@ -79,7 +80,6 @@ Here's the resulting cube file, illustrating the constrained region of evaluatio
 
 <img src="examples/example.png" width="500">
 
-
 ### For maintainers:
 
 In order to make a new release of the library and publish to PYPI, run
diff --git a/spherical_harmonics.nb b/notebooks/spherical_harmonics.nb
similarity index 100%
rename from spherical_harmonics.nb
rename to notebooks/spherical_harmonics.nb