diff --git a/wifi/supplicant/aidl/android/hardware/wifi/supplicant/P2pUsdBasedServiceAdvertisementConfig.aidl b/wifi/supplicant/aidl/android/hardware/wifi/supplicant/P2pUsdBasedServiceAdvertisementConfig.aidl
index 1920f1a..c657d03 100644
--- a/wifi/supplicant/aidl/android/hardware/wifi/supplicant/P2pUsdBasedServiceAdvertisementConfig.aidl
+++ b/wifi/supplicant/aidl/android/hardware/wifi/supplicant/P2pUsdBasedServiceAdvertisementConfig.aidl
@@ -27,7 +27,10 @@
     /** UTF-8 string defining the service */
     String serviceName;
 
-    /** Service Protocol Type */
+    /**
+     * Service Protocol Type. See defined values in the Wi-Fi Direct R2 Spec, Table 129,
+     * although any value between 0-255 may be defined by the service layer and is considered valid.
+     */
     int serviceProtocolType;
 
     /** Service specific information content determined by the application */
diff --git a/wifi/supplicant/aidl/android/hardware/wifi/supplicant/P2pUsdBasedServiceDiscoveryConfig.aidl b/wifi/supplicant/aidl/android/hardware/wifi/supplicant/P2pUsdBasedServiceDiscoveryConfig.aidl
index c7d6f0e..9d6bf72 100644
--- a/wifi/supplicant/aidl/android/hardware/wifi/supplicant/P2pUsdBasedServiceDiscoveryConfig.aidl
+++ b/wifi/supplicant/aidl/android/hardware/wifi/supplicant/P2pUsdBasedServiceDiscoveryConfig.aidl
@@ -29,7 +29,10 @@
     /** UTF-8 string defining the service */
     String serviceName;
 
-    /** Service Protocol Type */
+    /**
+     * Service Protocol Type. See defined values in the Wi-Fi Direct R2 Spec, Table 129,
+     * although any value between 0-255 may be defined by the service layer and is considered valid.
+     */
     int serviceProtocolType;
 
     /** Service specific information content determined by the application */
diff --git a/wifi/supplicant/aidl/android/hardware/wifi/supplicant/P2pUsdBasedServiceDiscoveryResultParams.aidl b/wifi/supplicant/aidl/android/hardware/wifi/supplicant/P2pUsdBasedServiceDiscoveryResultParams.aidl
index becc437..6b60d68 100644
--- a/wifi/supplicant/aidl/android/hardware/wifi/supplicant/P2pUsdBasedServiceDiscoveryResultParams.aidl
+++ b/wifi/supplicant/aidl/android/hardware/wifi/supplicant/P2pUsdBasedServiceDiscoveryResultParams.aidl
@@ -35,7 +35,10 @@
     /** Identifier to identify the peer service advertisement instance */
     int peerSessionId;
 
-    /** Service Protocol Type */
+    /**
+     * Service Protocol Type. See defined values in the Wi-Fi Direct R2 Spec, Table 129,
+     * although any value between 0-255 may be defined by the service layer and is considered valid.
+     */
     int serviceProtocolType;
 
     /** Service specific information content determined by the application */