diff --git a/README.md b/README.md
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 ## Programming Basics: Python Data analysis and more
 
 * [Numpy: rfft and spectral power](numpy_fft_1/README.md)
-* [scipy.signal -- Butterworth low, high and band-pass](scipy.signal_butterworth/README.md)
+* [scipy.signal: Butterworth low, high and band-pass](scipy.signal_butterworth/README.md)
 
 Note: I will transfer https://www.neurotec.uni-bremen.de/drupal/teaching to this new place (and update it).