diff --git a/YACReaderLibrary/db/data_base_management.h b/YACReaderLibrary/db/data_base_management.h
index 68540339..3d7139e2 100644
--- a/YACReaderLibrary/db/data_base_management.h
+++ b/YACReaderLibrary/db/data_base_management.h
@@ -38,6 +38,7 @@ private:
 	static void bindValuesFromRecord(const QSqlRecord & record, QSqlQuery & query);
 
     static bool addColumns(const QString & tableName, const QStringList & columnDefs, const QSqlDatabase & db);
+    static bool addConstraint(const QString  &tableName, const QString & constraint, const QSqlDatabase & db);
 
 public:
 	DataBaseManagement();