diff --git a/core/api/system-current.txt b/core/api/system-current.txt
index 58965ef4dee74..9650e547546f5 100644
--- a/core/api/system-current.txt
+++ b/core/api/system-current.txt
@@ -661,6 +661,10 @@ package android.app {
     field public static final int FLAG_AUTOGROUP_SUMMARY = 1024; // 0x400
   }
 
+  public static class Notification.Action implements android.os.Parcelable {
+    field public static final int SEMANTIC_ACTION_MARK_CONVERSATION_AS_PRIORITY = 11; // 0xb
+  }
+
   public static final class Notification.TvExtender implements android.app.Notification.Extender {
     ctor public Notification.TvExtender();
     ctor public Notification.TvExtender(android.app.Notification);
diff --git a/core/java/android/app/Notification.java b/core/java/android/app/Notification.java
index 8242e4db16c3b..ce97454735273 100644
--- a/core/java/android/app/Notification.java
+++ b/core/java/android/app/Notification.java
@@ -1523,6 +1523,14 @@ public class Notification implements Parcelable
          */
         public static final int SEMANTIC_ACTION_CALL = 10;
 
+        /**
+         * {@code SemanticAction}: Mark the conversation associated with the notification as a
+         * priority. Note that this is only for use by the notification assistant services.
+         * @hide
+         */
+        @SystemApi
+        public static final int SEMANTIC_ACTION_MARK_CONVERSATION_AS_PRIORITY = 11;
+
         private final Bundle mExtras;
         @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
         private Icon mIcon;
@@ -2233,7 +2241,8 @@ public class Notification implements Parcelable
                 SEMANTIC_ACTION_UNMUTE,
                 SEMANTIC_ACTION_THUMBS_UP,
                 SEMANTIC_ACTION_THUMBS_DOWN,
-                SEMANTIC_ACTION_CALL
+                SEMANTIC_ACTION_CALL,
+                SEMANTIC_ACTION_MARK_CONVERSATION_AS_PRIORITY
         })
         @Retention(RetentionPolicy.SOURCE)
         public @interface SemanticAction {}