From e8020e2c5cd6dca816991845bd439e4524594f83 Mon Sep 17 00:00:00 2001
From: Armin Ronacher <armin.ronacher@active-4.com>
Date: Sun, 18 Sep 2011 12:22:15 +0200
Subject: [PATCH] Added comment to the importer wiping.

---
 flask/ext/__init__.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/flask/ext/__init__.py b/flask/ext/__init__.py
index 742e35dd..078e7dbd 100644
--- a/flask/ext/__init__.py
+++ b/flask/ext/__init__.py
@@ -31,6 +31,11 @@ class _ExtensionImporter(object):
         self.prefix = __name__ + '.'
         self.prefix_cutoff = __name__.count('.') + 1
 
+        # since people might reload the flask.ext module (by accident or
+        # intentionally) we have to make sure to not add more than one
+        # import hook.  We can't check class types here either since a new
+        # class will be created on reload.  As a result of that we check
+        # the name of the class and remove stale instances.
         def _name(x):
             cls = type(x)
             return cls.__module__ + '.' + cls.__name__