diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 902907a..eede081 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -2106,6 +2106,8 @@ function theme_more_link($variables) {
 /**
  * Returns HTML for a progress bar.
  *
+ * Note that this is only used for non-javascript batch jobs.
+ *
  * @param $variables
  *   An associative array containing:
  *   - percent: The percentage of the progress.