diff --git a/gas_lib.gs b/gas_lib.gs
index cacc039..56898e3 100644
--- a/gas_lib.gs
+++ b/gas_lib.gs
@@ -1,4 +1,5 @@
 // gas_lib.gs - Common utilities & static features
+// Last Updated: 2026-06-13 18:48:40 KST
 // Math/KRX utils, sheet I/O, sector flow, Web API, static runners
 // GAS global scope: functions in gas_data_feed.gs / gas_data_collect.gs callable directly
 //
diff --git a/src/gas/core/gas_lib.gs b/src/gas/core/gas_lib.gs
index 6d75f2f..0c91e0f 100644
--- a/src/gas/core/gas_lib.gs
+++ b/src/gas/core/gas_lib.gs
@@ -1,4 +1,5 @@
 // gas_lib.gs - Common utilities & static features
+// Last Updated: 2026-06-13 18:48:40 KST
 // Math/KRX utils, sheet I/O, sector flow, Web API, static runners
 // GAS global scope: functions in gas_data_feed.gs / gas_data_collect.gs callable directly
 //