From 8bb6711f5f115c9849131486bedb3ba16d9f4138 Mon Sep 17 00:00:00 2001
From: Daniel Heath <daniel@heath.cc>
Date: Tue, 22 Mar 2016 07:58:00 +1100
Subject: [PATCH] Document substring matching for attribute search

Change-Id: I650c94d24fc8c351ac25bb6503c2a884e03f8306
---
 doc/search-ui.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/doc/search-ui.txt b/doc/search-ui.txt
index 2233fb4b6..a1303ee89 100644
--- a/doc/search-ui.txt
+++ b/doc/search-ui.txt
@@ -27,7 +27,8 @@ Usable operators:
     after:         date format is RFC3339, but can be shortened as required.
     before:        i.e. 2011-01-01 is Jan 1 of year 2011 and "2011" means the same.
     attr:          match on attribute. Use attr:foo:bar to match nodes having their foo
-                   attribute set to bar.
+                   attribute set to bar, or attr:foo:~bar to match nodes whose foo
+                   attribute contains bar (case insensitive substring match).
     format:        file's format (or MIME-type) such as jpg, pdf, tiff.
     has:location   image has a location (GPSLatitude and GPSLongitude can be
                    retrieved from the image's EXIF tags).