diff --git a/core/api/current.txt b/core/api/current.txt
index 131db7320f3f0..d72961085c204 100644
--- a/core/api/current.txt
+++ b/core/api/current.txt
@@ -27373,6 +27373,7 @@ package android.nfc.cardemulation {
     field public static final String CATEGORY_PAYMENT = "payment";
     field public static final String EXTRA_CATEGORY = "category";
     field public static final String EXTRA_SERVICE_COMPONENT = "component";
+    field public static final String EXTRA_USERID = "android.nfc.cardemulation.extra.USERID";
     field public static final int SELECTION_MODE_ALWAYS_ASK = 1; // 0x1
     field public static final int SELECTION_MODE_ASK_IF_CONFLICT = 2; // 0x2
     field public static final int SELECTION_MODE_PREFER_DEFAULT = 0; // 0x0
diff --git a/core/java/android/nfc/cardemulation/CardEmulation.java b/core/java/android/nfc/cardemulation/CardEmulation.java
index 9a780c8a29359..0a9fe90f25249 100644
--- a/core/java/android/nfc/cardemulation/CardEmulation.java
+++ b/core/java/android/nfc/cardemulation/CardEmulation.java
@@ -83,6 +83,13 @@ public final class CardEmulation {
      */
     public static final String EXTRA_SERVICE_COMPONENT = "component";
 
+    /**
+     * The caller userId extra for {@link #ACTION_CHANGE_DEFAULT}.
+     *
+     * @see #ACTION_CHANGE_DEFAULT
+     */
+    public static final String EXTRA_USERID = "android.nfc.cardemulation.extra.USERID";
+
     /**
      * Category used for NFC payment services.
      */