--- libgig/trunk/src/gig.cpp	2017/05/14 17:08:42	3181
+++ libgig/trunk/src/gig.cpp	2017/05/14 20:40:02	3182
@@ -1817,6 +1817,11 @@
     }
 
     void DimensionRegion::serialize(Serialization::Archive* archive) {
+        // in case this class will become backward incompatible one day,
+        // then set a version and minimum version for this class like:
+        //archive->setVersion(*this, 2);
+        //archive->setMinVersion(*this, 1);
+
         SRLZ(VelocityUpperLimit);
         SRLZ(EG1PreAttack);
         SRLZ(EG1Attack);