diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index 924684499c324..b554a62c9cadc 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -5410,7 +5410,7 @@ function wp_is_numeric_array( $data ): bool {
  * @param string      $operator   Optional. The logical operation to perform. 'AND' means
  *                                all elements from the array must match. 'OR' means only
  *                                one element needs to match. 'NOT' means no elements may
- *                                match. Default 'AND'.
+ *                                match. The value is case-insensitive. Default 'and'.
  * @param bool|string $field      Optional. A field from the object to place instead
  *                                of the entire object. Default false.
  * @return array A list of objects or object fields.