diff --git a/workflow/engine/config/schema.xml b/workflow/engine/config/schema.xml
index 6c395243e..7e0e6b460 100755
--- a/workflow/engine/config/schema.xml
+++ b/workflow/engine/config/schema.xml
@@ -346,6 +346,9 @@
         <index name="indexAppUid">
             <index-column name="APP_UID"/>
         </index>
+        <index name="indexDocId">
+            <index-column name="DOC_ID"/>
+        </index>
         <index name="indexAppUidDocUidDocVersionDocType">
             <index-column name="APP_UID"/>
             <index-column name="DOC_UID"/>
diff --git a/workflow/engine/data/mysql/schema.sql b/workflow/engine/data/mysql/schema.sql
index bd78d4fa3..481f772f6 100644
--- a/workflow/engine/data/mysql/schema.sql
+++ b/workflow/engine/data/mysql/schema.sql
@@ -144,6 +144,7 @@ CREATE TABLE `APP_DOCUMENT`
 	KEY `indexAppDocument`(`FOLDER_UID`, `APP_DOC_UID`),
 	KEY `indexAppUid`(`APP_UID`),
 	KEY `indexAppUidDocUidDocVersionDocType`(`APP_UID`, `DOC_UID`, `DOC_VERSION`, `APP_DOC_TYPE`),
+	KEY `indexDocId`(`DOC_ID`),
 	KEY `indexFolderUidDocStatus`(`FOLDER_UID`, `APP_DOC_STATUS`)
 )ENGINE=InnoDB  DEFAULT CHARSET='utf8' COMMENT='Documents in an Application';
 #-----------------------------------------------------------------------------