From 543a6e169c20280af647a655f27fd7982cbe8f27 Mon Sep 17 00:00:00 2001
From: Tom MacWright <tom@macwright.org>
Date: Wed, 9 Jan 2013 13:59:32 -0500
Subject: [PATCH] Transients

---
 NOTES.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/NOTES.md b/NOTES.md
index 7c24ac2ff..c2076a1d7 100644
--- a/NOTES.md
+++ b/NOTES.md
@@ -292,3 +292,10 @@ webkit doesn't let querySelectorAll select camelcase elements:
 * https://bugs.webkit.org/show_bug.cgi?id=46800
 * https://bugs.webkit.org/show_bug.cgi?id=83438
 * https://github.com/mbostock/d3/issues/925
+
+## Transients
+
+The graph supports `transient`, which is storage for non-versioned mutable
+properties _about_ entities that are stored outside of entities. For instance,
+`extent` is about an entity, but can be invalidated and stored without getting
+a new graph.