diff --git a/ex4.3/String.hh b/ex4.3/String.hh
index cb2cd91..daf8c96 100644
--- a/ex4.3/String.hh
+++ b/ex4.3/String.hh
@@ -32,4 +32,6 @@ private:
 
 } ;
 
+String operator+( const String& lhs, const String& rhs );
+
 #endif