diff --git a/includes/theme.inc b/includes/theme.inc
index 3868334..b59aa52 100644
--- a/includes/theme.inc
+++ b/includes/theme.inc
@@ -2104,6 +2104,7 @@ function theme_username($variables) {
 
 /**
  * Returns HTML for a progress bar.
+ * Note that this is only used for non-javascript batch jobs.
  *
  * @param $variables
  *   An associative array containing: