From 9505363f5025f8f14966911fd8c00e9e4c7f6046 Mon Sep 17 00:00:00 2001
From: Scott Sanderson <ssanderson@quantopian.com>
Date: Sat, 19 Mar 2016 16:00:39 -0400
Subject: [PATCH] DOC: Add comment.

---
 zipline/pipeline/factors/factor.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/zipline/pipeline/factors/factor.py b/zipline/pipeline/factors/factor.py
index 8ce4106f..106f24a8 100644
--- a/zipline/pipeline/factors/factor.py
+++ b/zipline/pipeline/factors/factor.py
@@ -374,6 +374,7 @@ def restrict_to_dtype(dtype, message_template):
         return factor_instance
     return preprocess(self=processor)
 
+# Decorators for Factor methods.
 if_not_float64_tell_caller_to_use_isnull = restrict_to_dtype(
     dtype=float64_dtype,
     message_template=(