Index: wp-admin/includes/media.php
===================================================================
--- wp-admin/includes/media.php	(revision 19188)
+++ wp-admin/includes/media.php	(working copy)
@@ -2001,11 +2001,16 @@
 <p class="hide-if-no-js"><label>
 <input name="image_resize" type="checkbox" id="image_resize" value="true"<?php echo $checked; ?> />
 <?php
-	/* translators: %1$s is link start tag, %2$s is link end tag, %3$d is width, %4$d is height*/
-	printf( __( 'Scale images to match the large size selected in %1$simage options%2$s (%3$d &times; %4$d).' ), $a, $end, (int) get_option( 'large_size_w', '1024' ), (int) get_option( 'large_size_h', '1024' ) );
+	print( __( 'Scale down large images' ) );
 ?>
 </label></p>
+<p class="hide-if-no-js">
 <?php
+	/* translators: %1$s is link start tag, %2$s is link end tag, %3$d is width, %4$d is height*/
+	printf( __( 'Images will be proportionally resized to the large size selected in %1$simage options%2$s (%3$d &times; %4$d) if they are bigger.' ), $a, $end, (int) get_option( 'large_size_w', '1024' ), (int) get_option( 'large_size_h', '1024' ) );
+?>
+</p>
+<?php
 }
 
 add_action( 'post-upload-ui', 'media_upload_max_image_resize' );