Is there an hook to react to custom entity updates? I need to react to updates of custom entities wich are using Entity API (Redhen organization in my case).

I tried using hook_entity_update($entity, $type) but it does not seem to be fired when updating said entity.

Thank you for your time.
If it can help other people :

hook_entity_update is working fine as long as it is declared in the .module file.

I putted it int an inc file so it was never fired !