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-rw-r--r--include/config_default.inc.php3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/config_default.inc.php b/include/config_default.inc.php
index 90d2cabf9..dbd5beb51 100644
--- a/include/config_default.inc.php
+++ b/include/config_default.inc.php
@@ -176,7 +176,8 @@ $conf['gallery_description'] = 'My photos web site';
// galery_url : URL given in RSS feed
$conf['gallery_url'] = 'http://demo.phpwebgallery.net';
-// prefix_thumbnail : string before filename
+// prefix_thumbnail : string before filename. Thumbnail's prefix must only
+// contain characters among : a to z (case insensitive), "-" or "_".
$conf['prefix_thumbnail'] = 'TN-';
// +-----------------------------------------------------------------------+