diff --git a/api.capnp b/api.capnp
index e5a75a3..54ce797 100644
--- a/api.capnp
+++ b/api.capnp
@@ -102,6 +102,10 @@ struct Machine {
             ret @0 () -> ();
             # Calling this function will return the machine and set its state as appropiate
         }
+        
+        reserve @1 () -> ( ret :GiveBack );
+        # Try to reserve a machine. returns a NULL-ptr if the user does not have the required
+        # permissions to reserve this machine
     }