diff --git a/src/wp-includes/class-wp-query.php b/src/wp-includes/class-wp-query.php
index 6936345905..baefec75b4 100644
--- a/src/wp-includes/class-wp-query.php
+++ b/src/wp-includes/class-wp-query.php
@@ -3872,7 +3872,8 @@ class WP_Query {
 	}
 
 	/**
-	 * Is the query for an existing single post of any post type (post, attachment, page, ... )?
+	 * Is the query for an existing single post of any post type (post, attachment, page,
+	 * custom post types)?
 	 *
 	 * If the $post_types parameter is specified, this function will additionally
 	 * check if the query is for one of the Posts Types specified.
diff --git a/src/wp-includes/query.php b/src/wp-includes/query.php
index 744610f425..439362bc5c 100644
--- a/src/wp-includes/query.php
+++ b/src/wp-includes/query.php
@@ -597,7 +597,8 @@ function is_single( $post = '' ) {
 }
 
 /**
- * Is the query for an existing single post of any post type (post, attachment, page, ... )?
+ * Is the query for an existing single post of any post type (post, attachment, page,
+ * custom post types)?
  *
  * If the $post_types parameter is specified, this function will additionally
  * check if the query is for one of the Posts Types specified.