- Added comment to inform user how to install the required RtlSdr package.

Author: TVH7

examples/visualize_psd.py

@@ -10,6 +10,7 @@
 PARENT_DIR = os.path.dirname(CURRENT_DIR)
 sys.path.insert(0, PARENT_DIR)
 
+# Install rtlsdr package from pyrtlsdr
 from rtlsdr import RtlSdr
 import matplotlib.pyplot as plt
 import numpy as np