diff --git a/ecsact/runtime/async.h b/ecsact/runtime/async.h
index 9f7d502c..c9684280 100644
--- a/ecsact/runtime/async.h
+++ b/ecsact/runtime/async.h
@@ -202,13 +202,15 @@ ECSACT_ASYNC_API_FN(int32_t, ecsact_async_get_current_tick)(void);
 /**
  * Sends Ecsact stream data to the specified registry. Stream data will be
  * applied on the next ecsact_execute_systems call.
+ *
+ * @param ... if the component has indexed fields then those fields must be
+ *        supplied to the variadic arguments in declaration order.
  */
 ECSACT_CORE_API_FN(ecsact_async_request_id, ecsact_async_stream)
 ( //
-	int32_t                    count,
-	const ecsact_entity_id*    entities,
-	const ecsact_component_id* component_ids,
-	const void**               components_data
+	ecsact_entity_id    entity,
+	ecsact_component_id component_id,
+	const void*         component_data
 );
 
 #define FOR_EACH_ECSACT_ASYNC_API_FN(fn, ...)              \
diff --git a/ecsact/runtime/core.h b/ecsact/runtime/core.h
index c9e43477..d4c08f63 100644
--- a/ecsact/runtime/core.h
+++ b/ecsact/runtime/core.h
@@ -260,15 +260,18 @@ ECSACT_CORE_API_FN(ecsact_ees, ecsact_get_entity_execution_status)
 
 /**
  * Sends Ecsact stream data to the specified registry. Stream data will be
- * applied on the next ecsact_execute_systems call.
+ * applied on the next ecsact_execute_systems call. The last set of stream data
+ * is always used.
+ *
+ * @param ... if the component has indexed fields then those fields must be
+ *        supplied to the variadic arguments in declaration order.
  */
 ECSACT_CORE_API_FN(ecsact_stream_error, ecsact_stream)
 ( //
-	ecsact_registry_id         registry_id,
-	int32_t                    count,
-	const ecsact_entity_id*    entities,
-	const ecsact_component_id* component_ids,
-	const void**               components_data
+	ecsact_registry_id  registry_id,
+	ecsact_entity_id    entity,
+	ecsact_component_id component_id,
+	const void*         component_data
 );
 
 // # BEGIN FOR_EACH_ECSACT_CORE_API_FN