diff --git a/api/system-current.txt b/api/system-current.txt
index 9b62fcc03313a..b0fe30525f7d1 100755
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -8987,6 +8987,7 @@ package android.telephony {
     method public int getSleepTimeMillis();
     method public long getTimestamp();
     method @NonNull public java.util.List<android.telephony.ModemActivityInfo.TransmitPower> getTransmitPowerInfo();
+    method public boolean isValid();
     method public void writeToParcel(@NonNull android.os.Parcel, int);
     field @NonNull public static final android.os.Parcelable.Creator<android.telephony.ModemActivityInfo> CREATOR;
     field public static final int TX_POWER_LEVELS = 5; // 0x5
diff --git a/telephony/java/android/telephony/ModemActivityInfo.java b/telephony/java/android/telephony/ModemActivityInfo.java
index aee7cca752522..bd2375f7d2972 100644
--- a/telephony/java/android/telephony/ModemActivityInfo.java
+++ b/telephony/java/android/telephony/ModemActivityInfo.java
@@ -199,10 +199,10 @@ public final class ModemActivityInfo implements Parcelable {
     }
 
     /**
+     * Indicate if the ModemActivityInfo is invalid due to modem's invalid reporting.
+     *
      * @return {@code true} if this {@link ModemActivityInfo} record is valid,
      * {@code false} otherwise.
-     *
-     * @hide
      */
     public boolean isValid() {
         for (TransmitPower powerInfo : getTransmitPowerInfo()) {