diff --git a/README.md b/README.md
index c1cc9da..b1578e9 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ cd bookbot
 You can print the program's help message with the `-h` flag.
 
 ```sh
-python bookbot.py -h
+./bookbot -h
 ```
 
 Download a book in text format (e.g. txt, markdown, etc).
@@ -37,7 +37,7 @@ curl -L https://raw.githubusercontent.com/asweigart/codebreaker/master/frankenst
 Run Bookbot to produce the book report.
 
 ```sh
-$ python bookbot.py books/frankenstein.txt
+$ ./bookbot books/frankenstein.txt
 --- Begin report of books/frankenstein.txt ---
 77986 words found in the document
 
diff --git a/bookbot.py b/bookbot
old mode 100644
new mode 100755
similarity index 99%
rename from bookbot.py
rename to bookbot
index 2260cf7..824e920
--- a/bookbot.py
+++ b/bookbot
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 '''
 Bookbot reads a book from a text file and prints out a simple report about it
 to the standard output.