diff --git a/core/api/current.txt b/core/api/current.txt
index 66aeb0f..57cb407 100644
--- a/core/api/current.txt
+++ b/core/api/current.txt
@@ -12675,6 +12675,7 @@
     method public boolean isDeviceUpgrading();
     method public abstract boolean isInstantApp();
     method public abstract boolean isInstantApp(@NonNull String);
+    method @FlaggedApi("android.content.pm.quarantined_enabled") public boolean isPackageQuarantined(@NonNull String) throws android.content.pm.PackageManager.NameNotFoundException;
     method @FlaggedApi("android.content.pm.stay_stopped") public boolean isPackageStopped(@NonNull String) throws android.content.pm.PackageManager.NameNotFoundException;
     method public boolean isPackageSuspended(@NonNull String) throws android.content.pm.PackageManager.NameNotFoundException;
     method public boolean isPackageSuspended();
@@ -12913,6 +12914,7 @@
     field public static final int MATCH_DIRECT_BOOT_UNAWARE = 262144; // 0x40000
     field public static final int MATCH_DISABLED_COMPONENTS = 512; // 0x200
     field public static final int MATCH_DISABLED_UNTIL_USED_COMPONENTS = 32768; // 0x8000
+    field @FlaggedApi("android.content.pm.quarantined_enabled") public static final long MATCH_QUARANTINED_COMPONENTS = 4294967296L; // 0x100000000L
     field public static final int MATCH_SYSTEM_ONLY = 1048576; // 0x100000
     field public static final int MATCH_UNINSTALLED_PACKAGES = 8192; // 0x2000
     field public static final long MAXIMUM_VERIFICATION_TIMEOUT = 3600000L; // 0x36ee80L
diff --git a/core/java/android/content/pm/PackageManager.java b/core/java/android/content/pm/PackageManager.java
index 1b60f8e..b15c9e4 100644
--- a/core/java/android/content/pm/PackageManager.java
+++ b/core/java/android/content/pm/PackageManager.java
@@ -1256,8 +1256,10 @@
     public static final long MATCH_ARCHIVED_PACKAGES = 1L << 32;
 
     /**
-     * @hide
+     * Querying flag: always match components of packages in quarantined state.
+     * @see #isPackageQuarantined
      */
+    @FlaggedApi(android.content.pm.Flags.FLAG_QUARANTINED_ENABLED)
     public static final long MATCH_QUARANTINED_COMPONENTS = 0x100000000L;
 
     /**
@@ -9902,12 +9904,16 @@
 
     /**
      * Query if an app is currently quarantined.
+     * A misbehaving app can be quarantined by e.g. a system of another privileged entity.
+     * Quarantined apps are similar to disabled, but still visible in e.g. Launcher.
+     * Only activities of such apps can still be queried, but not services etc.
+     * Quarantined apps can't be bound to, and won't receive broadcasts.
+     * They can't be resolved, unless {@link #MATCH_QUARANTINED_COMPONENTS} specified.
      *
      * @return {@code true} if the given package is quarantined, {@code false} otherwise
      * @throws NameNotFoundException if the package could not be found.
-     *
-     * @hide
      */
+    @FlaggedApi(android.content.pm.Flags.FLAG_QUARANTINED_ENABLED)
     public boolean isPackageQuarantined(@NonNull String packageName) throws NameNotFoundException {
         throw new UnsupportedOperationException("isPackageQuarantined not implemented");
     }