diff --git a/current.txt b/current.txt
index b8457f8..909732f 100644
--- a/current.txt
+++ b/current.txt
@@ -392,3 +392,5 @@
 1d4a5776614c08b5d794a5ec5ab04697260cbd4b3441d5935cd53ee71d19da02 android.hardware.radio@1.0::IRadioResponse
 271187e261b30c01a33011aea257c07a2d2f05b72943ebee89e973e997849973 android.hardware.radio@1.0::types
 1d19720d4fd38b1095f0f555a4bd92b3b12c9b1d0f560b0e9a474cd6dcc20db6 android.hardware.radio@1.2::IRadio
+1722ad002317b1fae1400de709e90f442d94ef22864e05f7a12af48c32e8edc8 android.hardware.usb@1.1::types
+29c8da7a13c40d488f569c812441d5754ee45bdcdb8ce6564f524b708d10a057 android.hardware.vibrator@1.1::types
diff --git a/usb/1.1/types.hal b/usb/1.1/types.hal
index 2261e09..c9cc292 100644
--- a/usb/1.1/types.hal
+++ b/usb/1.1/types.hal
@@ -18,6 +18,8 @@
 
 import android.hardware.usb@1.0;
 
+// NOTE: suffix '_1_1' is for legacy ABI compatibility. It cannot be
+// changed to 'PortMode' which the convention dictates.
 @export
 enum PortMode_1_1 : PortMode {
     /*
@@ -37,6 +39,8 @@
  * Used as the container to report data back to the caller.
  * Represents the current connection status of a single USB port.
  */
+// NOTE: suffix '_1_1' is for legacy ABI compatibility. It cannot be
+// changed to 'PortStatus' which the convention dictates.
 struct PortStatus_1_1 {
     /*
      * The supportedModes and the currentMode fields of the status
diff --git a/vibrator/1.1/types.hal b/vibrator/1.1/types.hal
index f7a619a..72deb4a 100644
--- a/vibrator/1.1/types.hal
+++ b/vibrator/1.1/types.hal
@@ -18,6 +18,8 @@
 
 import @1.0::Effect;
 
+// NOTE: suffix '_1_1' is for legacy ABI compatibility. It cannot be
+// changed to 'Effect' which the convention dictates.
 @export
 enum Effect_1_1 : @1.0::Effect {
     /**