diff --git a/nystrom_layer.py b/nystrom_layer.py
index a610db6fdadd6ece759bc9d8155c0ed4d608d91c..20a5fc37799e31e10a38d095369ba7d0532dc3ce 100644
--- a/nystrom_layer.py
+++ b/nystrom_layer.py
@@ -1,3 +1,9 @@
+"""
+Simple script that shows how a nystrom layer should be implemented.
+
+This doesn't aim at giving good results, just to show a simple implementation of the Nyström layer in a convolutional neural network.
+"""
+
 import keras
 import numpy as np
 from keras.datasets import cifar10