diff --git a/lockable.go b/lockable.go
index d85b8cd..caa17ff 100644
--- a/lockable.go
+++ b/lockable.go
@@ -100,7 +100,7 @@ func (ext *LockableExt) HandleLinkSignal(ctx *Context, node *Node, source NodeID
     case "remove":
       _, exists := ext.Requirements[signal.NodeID]
       if exists == false {
-        msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "not_requirement"), source)
+        msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "can't link: not_requirement"), source)
       } else {
         delete(ext.Requirements, signal.NodeID)
         msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "req_removed"), source)
@@ -122,8 +122,8 @@ func (ext *LockableExt) HandleLockSignal(ctx *Context, node *Node, source NodeID
   switch signal.State {
   case "locked":
     state, found := ext.Requirements[source]
-    if found == false {
-      msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "not_requirement"), source)
+    if found == false && source != node.ID {
+      msgs = msgs.Add(ctx, node.ID, node.Key, NewErrorSignal(signal.ID, "got 'locked' from non-requirement"), source)
     } else if state == Locking {
       if ext.State == Locking {
         ext.Requirements[source] = Locked
diff --git a/node.go b/node.go
index befb070..ec5b7d8 100644
--- a/node.go
+++ b/node.go
@@ -311,10 +311,10 @@ func nodeLoop(ctx *Context, node *Node) error {
           ctx.Send(msgs)
           continue
         } else if resp == Allow {
-          ctx.Log.Logf("policy", "SIGNAL_POLICY_ALLOW: %s->%s - %s", princ_id, node.ID, msg.Signal.Permission())
+          ctx.Log.Logf("policy", "SIGNAL_POLICY_ALLOW: %s->%s - %s", princ_id, node.ID, reflect.TypeOf(msg.Signal))
         }
       } else {
-        ctx.Log.Logf("policy", "SIGNAL_POLICY_SELF: %s - %s", node.ID, msg.Signal.Permission())
+        ctx.Log.Logf("policy", "SIGNAL_POLICY_SELF: %s - %s", node.ID, reflect.TypeOf(msg.Signal))
       }
 
       signal = msg.Signal
diff --git a/policy.go b/policy.go
index 0c7e792..1b31ed8 100644
--- a/policy.go
+++ b/policy.go
@@ -249,4 +249,5 @@ type AllNodesPolicy struct {
 
 var DefaultPolicy = NewAllNodesPolicy(Tree{
   ResultType: nil,
+  StatusType: nil,
 })
diff --git a/serialize.go b/serialize.go
index e6b4ec3..94338d8 100644
--- a/serialize.go
+++ b/serialize.go
@@ -141,6 +141,7 @@ var (
   PendingSignalType    = NewSerializedType("PENDING_SIGNAL")
   TimeType             = NewSerializedType("TIME")
   ResultType           = NewSerializedType("RESULT")
+  StatusType           = NewSerializedType("STATUS")
   TreeType             = NewSerializedType("TREE")
   SerializedTypeSerialized   = NewSerializedType("SERIALIZED_TYPE")
 )
diff --git a/signal.go b/signal.go
index 65a67aa..98f7b2a 100644
--- a/signal.go
+++ b/signal.go
@@ -25,7 +25,7 @@ func (header SignalHeader) Header() SignalHeader {
 }
 
 func (header SignalHeader) String() string {
-   return fmt.Sprintf("Signal(%d, %s->%s)", header.Direction, header.ID, header.ReqID)
+   return fmt.Sprintf("SignalHeader(%d, %s->%s)", header.Direction, header.ID, header.ReqID)
 }
 
 type Signal interface {
@@ -164,6 +164,9 @@ type ErrorSignal struct {
   SignalHeader
   Error string
 }
+func (signal ErrorSignal) String() string {
+  return fmt.Sprintf("ErrorSignal(%s, %s)", signal.SignalHeader, signal.Error)
+}
 func (signal ErrorSignal) Permission() Tree {
   return Tree{
     ResultType: {
@@ -200,7 +203,7 @@ type StatusSignal struct {
 }
 func (signal StatusSignal) Permission() Tree {
   return Tree{
-    SerializedType(StatusSignalType): nil,
+    StatusType: nil,
   }
 }
 func NewStatusSignal(source NodeID, status string) *StatusSignal {
@@ -242,6 +245,9 @@ type LockSignal struct {
   SignalHeader
   State string
 }
+func (signal LockSignal) String() string {
+  return fmt.Sprintf("LockSignal(%s, %s)", signal.SignalHeader, signal.State)
+}
 
 const (
   LockStateBase = "LOCK_STATE"