diff --git a/src/wp-includes/general-template.php b/src/wp-includes/general-template.php
index 715dab7d15..04df6989b6 100644
--- a/src/wp-includes/general-template.php
+++ b/src/wp-includes/general-template.php
@@ -1860,7 +1860,7 @@ function wp_get_archives( $args = '' ) {
  * @since 1.5.0
  *
  * @param int $num Number of day.
- * @return int Days since the start of the week.
+ * @return float Days since the start of the week.
  */
 function calendar_week_mod($num) {
 	$base = 7;