diff --git a/docs/features/xml-sitemaps/api.md b/docs/features/xml-sitemaps/api.md
index 1919cf37..47c69c75 100644
--- a/docs/features/xml-sitemaps/api.md
+++ b/docs/features/xml-sitemaps/api.md
@@ -52,7 +52,10 @@ add_filter( 'wpseo_sitemap_exclude_post_type', 'sitemap_exclude_post_type', 10,
  * @return bool Whether or not a given taxonomy should be excluded.
  */
 function sitemap_exclude_taxonomy( $excluded, $taxonomy ) {
-    return $taxonomy === 'ingredients';
+    if ( $taxonomy === 'ingredients' ) {
+         return true;
+    }
+    return $excluded;
 }
 
 add_filter( 'wpseo_sitemap_exclude_taxonomy', 'sitemap_exclude_taxonomy', 10, 2 );