diff -u b/core/modules/taxonomy/config/schema/taxonomy.schema.yml b/core/modules/taxonomy/config/schema/taxonomy.schema.yml
--- b/core/modules/taxonomy/config/schema/taxonomy.schema.yml
+++ b/core/modules/taxonomy/config/schema/taxonomy.schema.yml
@@ -46,7 +46,7 @@
   mapping:
     options_list_callback:
       type: string
-      label: 'Optional list callback'
+      label: 'Options list callback'
     allowed_values:
       type: sequence
       label: 'Allowed values'