diff --git a/rds_mysql/stored_procedure/crm_history.sql b/rds_mysql/stored_procedure/crm_history.sql
index cf2ca1d8..3247da51 100644
--- a/rds_mysql/stored_procedure/crm_history.sql
+++ b/rds_mysql/stored_procedure/crm_history.sql
@@ -2,23 +2,27 @@
 
 CREATE PROCEDURE crm_history(target_table VARCHAR(255), target_column VARCHAR(255))
 BEGIN
+	-- ①-1 Salesforce側で更新されたデータの適用開始日時と適用終了日時を設定する
 	SET @new_history_save = 'UPDATE @@target_table SET start_datetime = @@target_column, end_datetime = "9999-12-31 00:00:00" WHERE start_datetime IS NULL AND end_datetime IS NULL';
 	SET @new_history_save = REPLACE(@new_history_save, "@@target_table", target_table);
 	SET @new_history_save = REPLACE(@new_history_save, "@@target_column", target_column);
 	PREPARE new_history_save_stmt from @new_history_save;
 	EXECUTE new_history_save_stmt;
 
+	-- ②-1 Salesforce側で更新されたデータを検出用一時テーブルの作成
 	SET @make_history_tmp_create = 'CREATE TEMPORARY TABLE make_history_tmp SELECT id, MIN(@@target_column) AS min_start_datetime, MAX(start_datetime) AS max_start_datetime FROM @@target_table WHERE end_datetime = "9999-12-31 00:00:00" GROUP BY id';
 	SET @make_history_tmp_create = REPLACE(@make_history_tmp_create, "@@target_table", target_table);
     SET @make_history_tmp_create = REPLACE(@make_history_tmp_create, "@@target_column", target_column);
 	PREPARE make_history_tmp_create_stmt from @make_history_tmp_create;
 	EXECUTE make_history_tmp_create_stmt;
 
+	-- ②-2 「②-1」で取得した全件に更新処理を行う
 	SET @update_end_datetime = 'UPDATE @@target_table tt LEFT JOIN make_history_tmp mht ON tt.id = mht.id AND tt.start_datetime = mht.min_start_datetime SET start_datetime = mht.max_start_datetime - INTERVAL 1 SECOND WHERE mht.id IS NULL';
 	SET @update_end_datetime = REPLACE(@update_end_datetime, "@@target_table", target_table);
     SET @update_end_datetime = REPLACE(@update_end_datetime, "@@target_column", target_column);
 	PREPARE update_end_datetime_stmt from @update_end_datetime;
 	EXECUTE update_end_datetime_stmt;
 
+	-- ②-3 「②-1」で作成した一時テーブルを削除する
 	DROP TEMPORARY TABLE make_history_tmp;
 END
\ No newline at end of file