Index: wp-admin/includes/class-wp-ms-themes-list-table.php
===================================================================
--- wp-admin/includes/class-wp-ms-themes-list-table.php	(revision 19706)
+++ wp-admin/includes/class-wp-ms-themes-list-table.php	(working copy)
@@ -337,8 +337,15 @@
 						$theme_meta[] = '<a href="' . $theme['Theme URI'] . '" title="' . esc_attr__( 'Visit theme homepage' ) . '">' . __( 'Visit Theme Site' ) . '</a>';
 
 					$theme_meta = apply_filters( 'theme_row_meta', $theme_meta, $theme_key, $theme, $status );
-					echo implode( ' | ', $theme_meta );
+					echo implode( ' | ', $theme_meta ) . ' | ';
 
+					if ( current_user_can( 'edit_themes' ) && $theme['Parent Theme'] ) {
+						/* translators: 1: theme title, 2:  template dir, 3: stylesheet_dir, 4: theme title, 5: parent_theme */
+						printf( __( 'The template files are located in <code>%2$s</code>. The stylesheet files are located in <code>%3$s</code>. <strong>%4$s</strong> uses templates from <strong>%5$s</strong>. Changes made to the templates will affect both themes.' ), $theme['Title'], str_replace( WP_CONTENT_DIR, '', $theme['Template Dir'] ), str_replace( WP_CONTENT_DIR, '', $theme['Stylesheet Dir'] ), $theme['Title'], $theme['Parent Theme'] );
+					} else {
+						printf( __( 'All of this theme&#8217;s files are located in <code>%2$s</code>.' ), $theme['Title'], str_replace( WP_CONTENT_DIR, '', $theme['Template Dir'] ), str_replace( WP_CONTENT_DIR, '', $theme['Stylesheet Dir'] ) );
+					}
+
 					echo "</div></td>";
 					break;