From 0dea9c5ecb2154326ed7e7839d20b34c7b3aa6d6 Mon Sep 17 00:00:00 2001
From: fawce <fawce@quantopian.com>
Date: Thu, 7 Jun 2012 17:58:30 -0400
Subject: [PATCH] finished comment

---
 zipline/finance/performance.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/zipline/finance/performance.py b/zipline/finance/performance.py
index 9f32ae09..e237ec7b 100644
--- a/zipline/finance/performance.py
+++ b/zipline/finance/performance.py
@@ -68,7 +68,10 @@ Performance Period
 ==================
 
 Performance Periods are updated with every trade. When calling
-code needs
+code needs a portfolio object that fulfills the algorithm
+protocol, use the PerformancePeriod.as_portfolio method. See that
+method for comments on the specific fields provided (and
+omitted).
 
     +---------------+------------------------------------------------------+
     | key           | value                                                |