diff --git a/ch2/threads_v0.py b/ch2/threads_v0.py
index 7afd94e..6bdeaf7 100644
--- a/ch2/threads_v0.py
+++ b/ch2/threads_v0.py
@@ -7,6 +7,7 @@
 global count
 count = 0
 
+# This argument is used to tell the thread how many iters to go, e.g. 1000
 itersPerThread = int(argv[1])
 
 threadNum = 0
@@ -17,6 +18,9 @@ def __init__(self, iters):
         Thread.__init__(self, name="Thread-%d" % threadNum);
         threadNum += 1
         self.iters = iters
+    # Calling run creates a new virtual machine
+    # That virtual machine doesn't start running until I tell the thread to start
+    # Once it stops the virtual machine is destroyed
     def run(self):
         global count
         for i in range(self.iters):
@@ -29,6 +33,8 @@ def delay(sec):
 
 workers = [Worker(itersPerThread).start(), Worker(itersPerThread).start()]
 
+# Enumerate is a method of the Thread class.  It returns a list of threads that are
+# still running
 while len(enumerate()) > 1:
     delay(0.25)
     print("activeThreads=%s, count=%d" % (enumerate(), count))