Index: includes/EditPage.php
===================================================================
--- includes/EditPage.php	(revision 103890)
+++ includes/EditPage.php	(working copy)
@@ -1466,6 +1466,24 @@
 		if ( $namespace == NS_MEDIAWIKI ) {
 			# Show a warning if editing an interface message
 			$wgOut->wrapWikiMsg( "<div class='mw-editinginterface'>\n$1\n</div>", 'editinginterface' );
+		} else if( $namespace == NS_FILE ) {
+			# Show a hint to shared repo
+			$file = wfFindFile( $this->mTitle );
+			if( $file && !$file->isLocal() ) {
+				$descUrl = $file->getDescriptionUrl();
+				# there must be a description url to show a hint to shared repo
+				if( $descUrl ) {
+					if( !$this->mTitle->exists() ) {
+						$wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-create\">\n$1\n</div>", array (
+									'sharedupload-desc-create', $file->getRepo()->getDisplayName(), $descUrl
+						) );
+					} else {
+						$wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-edit\">\n$1\n</div>", array(
+									'sharedupload-desc-edit', $file->getRepo()->getDisplayName(), $descUrl
+						) );
+					}
+				}
+			}
 		}
 
 		# Show a warning message when someone creates/edits a user (talk) page but the user does not exist
Index: languages/messages/MessagesEn.php
===================================================================
--- languages/messages/MessagesEn.php	(revision 103890)
+++ languages/messages/MessagesEn.php	(working copy)
@@ -2345,6 +2345,10 @@
 Please see the [$2 file description page] for further information.',
 'sharedupload-desc-here'            => 'This file is from $1 and may be used by other projects.
 The description on its [$2 file description page] there is shown below.',
+'sharedupload-desc-edit'            => 'This file is from $1 and may be used by other projects.
+Maybe you want edit the description on its [$2 file description page] there.',
+'sharedupload-desc-create'          => 'This file is from $1 and may be used by other projects.
+Maybe you want edit the description on its [$2 file description page] there.',
 'shareddescriptionfollows'          => '-', # do not translate or duplicate this message to other languages
 'filepage-nofile'                   => 'No file by this name exists.',
 'filepage-nofile-link'              => 'No file by this name exists, but you can [$1 upload it].',
Index: maintenance/language/messages.inc
===================================================================
--- maintenance/language/messages.inc	(revision 103890)
+++ maintenance/language/messages.inc	(working copy)
@@ -1446,6 +1446,8 @@
 		'sharedupload',
 		'sharedupload-desc-there',
 		'sharedupload-desc-here',
+		'sharedupload-desc-edit',
+		'sharedupload-desc-create',
 		'shareddescriptionfollows',
 		'filepage-nofile',
 		'filepage-nofile-link',