[tracker] NFO: Document reason why there's an index on nfo:belongsToContainer

[Philip Van Hoof <pvanhoof src gnome org>]

commit fe6b7fdb2d29448247d45aefbb7d60ed305254e8
Author: Philip Van Hoof <philip codeminded be>
Date:   Fri Apr 30 16:13:12 2010 +0200

    NFO: Document reason why there's an index on nfo:belongsToContainer

 data/ontologies/Indices.list |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/data/ontologies/Indices.list b/data/ontologies/Indices.list
index 9e8f0d4..5b2f37a 100644
--- a/data/ontologies/Indices.list
+++ b/data/ontologies/Indices.list
@@ -24,6 +24,8 @@
 33-nfo:
 * nfo:fileLastModified:
   - The miner-fs uses this property during crawling a lot
+* nfo:belongsToContainer:
+  - The miner-fs uses this property during crawling a lot
 
 34-nmo:
 * nmo:from: