diff --git a/python/bench.py b/python/bench.py
index 6cdcbea..a3726c2 100755
--- a/python/bench.py
+++ b/python/bench.py
@@ -1,9 +1,13 @@
+#!/usr/bin/env python3
+
 import subprocess
 import sys
 from tqdm import tqdm
 from itertools import product
 import os
 
+# Bit lengths to try
+
 lens = [1_000_000,
         4_000_000,
         16_000_000,
@@ -12,10 +16,16 @@
         1_024_000_000,
         ]
 
+# Densities
+
 densities = [0.1, 0.5, 0.9]
 
+# Number of experiments 
+
 repeats = 7
 
+# Number of tested positions
+
 num_pos = 70_000_000
 
 
@@ -33,8 +43,10 @@ def run_bench(binary_name, bench_name, uniform=True):
     choices = ["rank", "select", "select_non_uniform"]
 
     if len(sys.argv) < 2:
-        print("Usage: python3 bench-scripts.py <choice>")
-        print("Choices: rank, select, select_non_uniform")
+        print("Usage: bench.py [rank|select|select_non_uniform]")
+        print()
+        print("Run the specified benchmarks and saves CSV files in bench-results")
+        print("Please compile the benchmarks with \"make ranksel\" first")
         sys.exit(1)
 
     choice = sys.argv[1]