diff --git a/core/java/com/android/internal/os/Zygote.java b/core/java/com/android/internal/os/Zygote.java
index c97fdf4..197004c 100644
--- a/core/java/com/android/internal/os/Zygote.java
+++ b/core/java/com/android/internal/os/Zygote.java
@@ -46,8 +46,12 @@
 
     /** No external storage should be mounted. */
     public static final int MOUNT_EXTERNAL_NONE = 0;
-    /** Default user-specific external storage should be mounted. */
+    /** Default external storage should be mounted. */
     public static final int MOUNT_EXTERNAL_DEFAULT = 1;
+    /** Read-only external storage should be mounted. */
+    public static final int MOUNT_EXTERNAL_READ = 2;
+    /** Read-write external storage should be mounted. */
+    public static final int MOUNT_EXTERNAL_WRITE = 3;
 
     private static final ZygoteHooks VM_HOOKS = new ZygoteHooks();