diff --git a/radio/1.4/vts/functional/radio_hidl_hal_api.cpp b/radio/1.4/vts/functional/radio_hidl_hal_api.cpp
index 696c746..a05f0a7 100644
--- a/radio/1.4/vts/functional/radio_hidl_hal_api.cpp
+++ b/radio/1.4/vts/functional/radio_hidl_hal_api.cpp
@@ -151,6 +151,11 @@
 
 /*
  * Test IRadio.startNetworkScan() for the response returned.
+ *
+ * REQUEST_NOT_SUPPORTED is temporarily returned because of vendors failed to fully implement
+ * startNetworkScan in HAL @1.4 (see b/137298570 and b/135595082). Starting from @1.5, however,
+ * REQUEST_NOT_SUPPORTED will be disallowed for all tests. Modems have "GSM" rat scan need to
+ * support scanning requests combined with some parameters.
  */
 TEST_F(RadioHidlTest_v1_4, startNetworkScan) {
     serial = GetRandomSerialNumber();