diff --git a/README.md b/README.md
index f9a2a8a..cc6e816 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,7 @@ dependencies:
 * [Planetary imaging basics](https://github.com/openplanetary/planetarygeology-book/blob/master/planetary-data-basics.ipynb)
 * [PCA to compress NASA's Pluto images](https://github.com/openplanetary/planetarygeology-book/blob/master/PCA%20to%20compress%20NASA's%20Pluto%20images.ipynb)
 * [Hypsometry of the Terrestrial planets](https://github.com/openplanetary/planetarygeology-book/blob/master/hypsometry_terrestrial_planets.ipynb)
-* [Hyperspecral data](https://github.com/openplanetary/planetarygeology-book/blob/master/spectral.ipynb)
+* [Hyperspectral data](https://github.com/openplanetary/planetarygeology-book/blob/master/spectral.ipynb)
 * [Thermal emission spectral data](https://github.com/openplanetary/planetarygeology-book/blob/master/thermalemissionspectrometer_spectral_data.ipynb)
 * [HRSC imagery and machine learning](https://github.com/openplanetary/planetarygeology-book/blob/master/HRSC_imaging_data_machine_learning_examples.ipynb)