diff --git a/copycat/codelet.py b/copycat/codelet.py
index edb4ed8..dbad36e 100644
--- a/copycat/codelet.py
+++ b/copycat/codelet.py
@@ -1,9 +1,9 @@
 class Codelet(object):
-    def __init__(self, name, urgency, timestamp):
+    def __init__(self, name, urgency, currentTime):
         self.name = name
         self.urgency = urgency
         self.arguments = []
-        self.timeStamp = timestamp
+        self.birthdate = currentTime
 
     def __repr__(self):
         return '<Codelet: %s>' % self.name
diff --git a/copycat/coderack.py b/copycat/coderack.py
index df1eb4b..ae98017 100644
--- a/copycat/coderack.py
+++ b/copycat/coderack.py
@@ -271,7 +271,7 @@ class Coderack(object):
             return None
         urgencies = []
         for codelet in self.codelets:
-            urgency = ((self.codeletsRun - codelet.timeStamp) *
+            urgency = ((self.codeletsRun - codelet.birthdate) *
                        (7.5 - codelet.urgency))
             urgencies += [urgency]
         threshold = random.random() * sum(urgencies)