diff --git a/telephony/java/android/telephony/emergency/EmergencyNumber.java b/telephony/java/android/telephony/emergency/EmergencyNumber.java
index aaa98eb7bd59b..733fb1e59a853 100644
--- a/telephony/java/android/telephony/emergency/EmergencyNumber.java
+++ b/telephony/java/android/telephony/emergency/EmergencyNumber.java
@@ -22,6 +22,7 @@ import android.hardware.radio.V1_4.EmergencyNumberSource;
 import android.hardware.radio.V1_4.EmergencyServiceCategory;
 import android.os.Parcel;
 import android.os.Parcelable;
+import android.telephony.CarrierConfigManager;
 import android.telephony.PhoneNumberUtils;
 import android.telephony.Rlog;
 
@@ -301,6 +302,9 @@ public final class EmergencyNumber implements Parcelable, Comparable<EmergencyNu
      * The character in the number string is only the dial pad
      * character('0'-'9', '*', '+', or '#'). For example: 911.
      *
+     * If the number starts with carrier prefix, the carrier prefix is configured in
+     * {@link CarrierConfigManager#KEY_EMERGENCY_NUMBER_PREFIX_STRING_ARRAY}.
+     *
      * @return the dialing number.
      */
     public @NonNull String getNumber() {