From 11197f6180ff0199d6e682ea9af5ed287dfd7eb8 Mon Sep 17 00:00:00 2001
From: Felipe Lessa <felipe.lessa@gmail.com>
Date: Thu, 28 May 2015 13:16:45 -0300
Subject: [PATCH] Add note about SQL index.

---
 README.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README.md b/README.md
index d4046b3..51ee4a0 100644
--- a/README.md
+++ b/README.md
@@ -104,6 +104,10 @@ though, please bear in mind that:
 
   * The Redis backend is not set to expire sessions yet.
 
+  * The `persistent` backend does not automatically create an
+    index for the auth ID.  Thus, by default the
+    `deleteAllSessionsOfAuthId` operation will take linear time.
+
 
 ## Background