diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b6b5a6e
--- /dev/null
+++ b/README.md
@@ -0,0 +1,9 @@
+# FabAccess API
+
+## Code generation bugs under c#
+When returning an Interface it may be required to append a dummy valueto work around a c# code generation bug.
+
+```diff
+- whoami @4 () -> ( you :Api.User );
++ whoami @4 () -> ( you :Api.User, dummy :UInt8 = 0  );
+```
diff --git a/connection.capnp b/connection.capnp
index 4e638a9..6ec6ad9 100644
--- a/connection.capnp
+++ b/connection.capnp
@@ -10,14 +10,12 @@ using AuthenticationSystem = import "authenticationsystem.capnp".AuthenticationS
 using MachineSystem = import "machinesystem.capnp".MachineSystem;
 using UserSystem = import "usersystem.capnp".UserSystem;
 using PermissionSystem = import "permissionsystem.capnp".PermissionSystem;
-using InteractionSystem = import "interactionsystem.capnp".InteractionSystem;
-using FederationSystem = import "federationsystem.capnp".FederationSystem;
 
 interface Bootstrap 
 {
     authenticationSystem @0 () -> ( authenticationSystem : AuthenticationSystem );
 
-	machineSystem @1 () -> ( machineSystem : MachineSystem );
+    machineSystem @1 () -> ( machineSystem : MachineSystem );
     
     userSystem @2 () -> ( userSystem : UserSystem );
 
diff --git a/machine.capnp b/machine.capnp
index 46453a6..be0ac7e 100644
--- a/machine.capnp
+++ b/machine.capnp
@@ -39,7 +39,7 @@ struct Machine {
 
     info @6 :Info;
     interface Info $CSharp.name("InfoInterface") {
-        getMachineInfoExtended @0 () -> ( machineInfoExtended :MachineInfoExtended);
+        getMachineInfoExtended @0 () -> ( machineInfoExtended :MachineInfoExtended, dummy :UInt8 = 0);
 
         getPropertyList @1 () -> ( propertyList :List(General.KeyValuePair) );
 
diff --git a/machinesystem.capnp b/machinesystem.capnp
index 7af2668..d658405 100644
--- a/machinesystem.capnp
+++ b/machinesystem.capnp
@@ -15,6 +15,6 @@ interface MachineSystem
     interface Info $CSharp.name("InfoInterface") {
     	getMachineList @0 () -> ( machine_list :List(Machine) );
 
-    	getMachine @1 ( uuid :General.UUID ) -> ( machine :Machine);
+    	getMachine @1 ( uuid :General.UUID ) -> ( machine :Machine, dummy :UInt8 = 0 );
 	}
 }
diff --git a/usersystem.capnp b/usersystem.capnp
index e742ba3..955514b 100644
--- a/usersystem.capnp
+++ b/usersystem.capnp
@@ -13,7 +13,7 @@ interface UserSystem
 {
 	info @0 () -> ( info : Info );
     interface Info $CSharp.name("InfoInterface") {
-    	getUserSelf @0 ( ) -> ( user :User );
+    	getUserSelf @0 ( ) -> ( user :User, dummy :UInt8 = 0 );
 	}
 
 	manage @1 () -> ( manage : Manage );
@@ -21,6 +21,6 @@ interface UserSystem
     	getUserList @0 () -> ( user_list :List(User) );
 
     	addUser @1 (username :Text, password: Text) -> ( user :User );
-    	removeUser @2 (user :User );
+    	removeUser @2 (user :User, dummy :UInt8 = 0);
 	}
 }
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