diff --git a/telephony/java/android/provider/Telephony.java b/telephony/java/android/provider/Telephony.java
index 4f78c4c..bff00b1 100644
--- a/telephony/java/android/provider/Telephony.java
+++ b/telephony/java/android/provider/Telephony.java
@@ -274,6 +274,70 @@
     }
 
     /**
+     * Columns in sms_changes table.
+     * @hide
+     */
+    public interface TextBasedSmsChangesColumns {
+        /**
+         * The {@code content://} style URL for this table.
+         * @hide
+         */
+        public static final Uri CONTENT_URI = Uri.parse("content://sms-changes");
+
+        /**
+         * Primary key.
+         * <P>Type: INTEGER (long)</P>
+         * @hide
+         */
+        public static final String ID = "_id";
+
+        /**
+         * Triggers on sms table create a row in this table for each update/delete.
+         * This column is the "_id" of the row from sms table that was updated/deleted.
+         * <P>Type: INTEGER (long)</P>
+         * @hide
+         */
+        public static final String ORIG_ROW_ID = "orig_rowid";
+
+        /**
+         * Triggers on sms table create a row in this table for each update/delete.
+         * This column is the "sub_id" of the row from sms table that was updated/deleted.
+         * @hide
+         * <P>Type: INTEGER (long)</P>
+         */
+        public static final String SUB_ID = "sub_id";
+
+        /**
+         * The type of operation that created this row.
+         *    {@link #TYPE_UPDATE} = update op
+         *    {@link #TYPE_DELETE} = delete op
+         * @hide
+         * <P>Type: INTEGER (long)</P>
+         */
+        public static final String TYPE = "type";
+
+        /**
+         * One of the possible values for the above column "type". Indicates it is an update op.
+         * @hide
+         */
+        public static final int TYPE_UPDATE = 0;
+
+        /**
+         * One of the possible values for the above column "type". Indicates it is a delete op.
+         * @hide
+         */
+        public static final int TYPE_DELETE = 1;
+
+        /**
+         * This column contains a non-null value only if the operation on sms table is an update op
+         * and the column "read" is changed by the update op.
+         * <P>Type: INTEGER (boolean)</P>
+         * @hide
+         */
+        public static final String NEW_READ_STATUS = "new_read_status";
+    }
+
+    /**
      * Contains all text-based SMS messages.
      */
     public static final class Sms implements BaseColumns, TextBasedSmsColumns {