Index: src/wp-includes/template.php
===================================================================
--- src/wp-includes/template.php	(revision 25702)
+++ src/wp-includes/template.php	(working copy)
@@ -26,7 +26,19 @@
 	if ( empty( $templates ) )
 		$templates = array("{$type}.php");
 
-	return apply_filters( "{$type}_template", locate_template( $templates ) );
+	$template = locate_template( $templates );
+	/**
+	 * Filter the path of the queried template by type.
+	 *
+	 * The dynamic portion of the hook name, $type, refers to the filename
+	 * -- minus the extension -- of the file to load. This hook also applies
+	 * to various types of files loaded as part of the Template Hierarchy.
+	 *
+	 * @since 1.5.2
+	 *
+	 * @param string $template Path to the template. @see locate_template()
+	 */
+	return apply_filters( "{$type}_template", $template );
 }
 
 /**