diff --git a/api/current.txt b/api/current.txt
index d0eee5c1a438c..ee766ac7cf1e4 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -7226,6 +7226,7 @@ package android.app.slice {
     field public static final java.lang.String HINT_TTL = "ttl";
     field public static final java.lang.String SUBTYPE_COLOR = "color";
     field public static final java.lang.String SUBTYPE_CONTENT_DESCRIPTION = "content_description";
+    field public static final java.lang.String SUBTYPE_LAYOUT_DIRECTION = "layout_direction";
     field public static final java.lang.String SUBTYPE_MAX = "max";
     field public static final java.lang.String SUBTYPE_MESSAGE = "message";
     field public static final java.lang.String SUBTYPE_MILLIS = "millis";
diff --git a/core/java/android/app/slice/Slice.java b/core/java/android/app/slice/Slice.java
index fc3b38d2bcfbb..bf3398ad3c731 100644
--- a/core/java/android/app/slice/Slice.java
+++ b/core/java/android/app/slice/Slice.java
@@ -87,6 +87,7 @@ public final class Slice implements Parcelable {
             SUBTYPE_SOURCE,
             SUBTYPE_TOGGLE,
             SUBTYPE_VALUE,
+            SUBTYPE_LAYOUT_DIRECTION,
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface SliceSubtype {}
@@ -189,6 +190,12 @@ public final class Slice implements Parcelable {
      * slices.
      */
     public static final String HINT_PERMISSION_REQUEST = "permission_request";
+    /**
+     * Subtype to indicate that this item indicates the layout direction for content
+     * in the slice.
+     * Expected to be an item of format {@link SliceItem#FORMAT_INT}.
+     */
+    public static final String SUBTYPE_LAYOUT_DIRECTION = "layout_direction";
     /**
      * Key to retrieve an extra added to an intent when a control is changed.
      */