diff --git a/optional.hpp b/optional.hpp
index f17e4da..d3bd44b 100644
--- a/optional.hpp
+++ b/optional.hpp
@@ -14,6 +14,9 @@
 #ifndef TL_OPTIONAL_HPP
 #define TL_OPTIONAL_HPP
 
+#define TL_OPTIONAL_VERSION_MAJOR 0
+#define TL_OPTIONAL_VERSION_MINOR 2
+
 #include <exception>
 #include <functional>
 #include <new>