Index: wp-admin/custom-header.php
===================================================================
--- wp-admin/custom-header.php	(revision 7174)
+++ wp-admin/custom-header.php	(working copy)
@@ -215,12 +215,17 @@
 		$file = $file['file'];
 		$filename = basename($file);
 
+		// Get current theme
+		$ct = current_theme_info();
+
 		// Construct the object array
 		$object = array(
-		'post_title' => $filename,
-		'post_content' => $url,
-		'post_mime_type' => $type,
-		'guid' => $url);
+			'post_title' => $filename,
+			'post_content' => $url,
+			'post_excerpt' => sprintf( __('Custom Header Image for %1$s (%2$d x %3$d)'), $ct->title, HEADER_IMAGE_WIDTH, HEADER_IMAGE_HEIGHT ),
+			'post_mime_type' => $type,
+			'guid' => $url
+		);
 
 		// Save the data
 		$id = wp_insert_attachment($object, $file);
@@ -292,11 +297,15 @@
 		$parent_url = $parent->guid;
 		$url = str_replace(basename($parent_url), basename($cropped), $parent_url);
 
+		// Get current theme
+		$ct = current_theme_info();
+
 		// Construct the object array
 		$object = array(
 			'ID' => $_POST['attachment_id'],
 			'post_title' => basename($cropped),
 			'post_content' => $url,
+			'post_excerpt' => sprintf( __('Custom Header Image for %1$s (%2$d x %3$d)'), $ct->title, HEADER_IMAGE_WIDTH, HEADER_IMAGE_HEIGHT ),
 			'post_mime_type' => 'image/jpeg',
 			'guid' => $url
 		);