diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 3691fb06abdb..8880bc492de7 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -4754,10 +4754,14 @@ public class CarrierConfigManager {
      * Either omit this key or pass a value of
      * {@link SubscriptionManager#USAGE_SETTING_UNKNOWN unknown} to preserve the current setting.
      *
+     * <p>Devices that support configuration of the cellular usage setting, including devices
+     * with HAL capability to set the cellular usage setting, must honor this setting accordingly.
+     *
      * {@link SubscriptionManager#USAGE_SETTING_DEFAULT default},
      * {@link SubscriptionManager#USAGE_SETTING_VOICE_CENTRIC voice-centric},
      * or {@link SubscriptionManager#USAGE_SETTING_DATA_CENTRIC data-centric}.
      * {@see SubscriptionInfo#getUsageSetting}
+     *
      */
     public static final String KEY_CELLULAR_USAGE_SETTING_INT =
             "cellular_usage_setting_int";
diff --git a/telephony/java/android/telephony/SubscriptionManager.java b/telephony/java/android/telephony/SubscriptionManager.java
index b6cacaf9f289..fc9acb81d408 100644
--- a/telephony/java/android/telephony/SubscriptionManager.java
+++ b/telephony/java/android/telephony/SubscriptionManager.java
@@ -1085,6 +1085,10 @@ public class SubscriptionManager {
      * <p>Refer to voice-centric mode in 3gpp 24.301 sec 4.3 and 3gpp 24.501 sec 4.3.
      * Also refer to "UE's usage setting" as defined in 3gpp 24.301 section 3.1 and 3gpp 23.221
      * Annex A.
+     *
+     * <p>Devices that support {@link PackageManager#FEATURE_TELEPHONY_CALLING} and support usage
+     * setting configuration must support setting this value via
+     * {@link CarrierConfigManager#KEY_CELLULAR_USAGE_SETTING_INT}.
      */
     public static final int USAGE_SETTING_VOICE_CENTRIC = 1;
 
@@ -1094,6 +1098,10 @@ public class SubscriptionManager {
      * <p>Refer to data-centric mode in 3gpp 24.301 sec 4.3 and 3gpp 24.501 sec 4.3.
      * Also refer to "UE's usage setting" as defined in 3gpp 24.301 section 3.1 and 3gpp 23.221
      * Annex A.
+     *
+     * <p>Devices that support {@link PackageManager#FEATURE_TELEPHONY_DATA} and support usage
+     * setting configuration must support setting this value via.
+     * {@link CarrierConfigManager#KEY_CELLULAR_USAGE_SETTING_INT}.
      */
     public static final int USAGE_SETTING_DATA_CENTRIC = 2;