diff --git a/src/backend/sgpemv2/history.hh b/src/backend/sgpemv2/history.hh
index 100bd93..6148d17 100644
--- a/src/backend/sgpemv2/history.hh
+++ b/src/backend/sgpemv2/history.hh
@@ -146,6 +146,9 @@ namespace sgpem
 
     void notify_change();
 
+		position _front;
+
+  private:
     /** \brief Enable/disable notifications to registered observers
      *
      * This is quite useful to disable momentarily notification while you
@@ -156,9 +159,6 @@ namespace sgpem
      */
     bool  set_notify_enabled(bool enabled = true);
 
-		position _front;
-
-  private:
     bool _notify;
 
   }; //~ class History
@@ -169,6 +169,8 @@ namespace sgpem
    * History that would reset it / notify its observers. For example, when loading
    * from a file. In this case, create an object of this type on the stack.
    * The destructor will take care of re-enabling notifications.
+   *
+   * Locks can be taken recursively without fear.
    */
   class SG_DLLEXPORT History::LockNotify
   {
diff --git a/src/backend/sgpemv2/simulation.hh b/src/backend/sgpemv2/simulation.hh
index 69275b0..b895c2c 100644
--- a/src/backend/sgpemv2/simulation.hh
+++ b/src/backend/sgpemv2/simulation.hh
@@ -177,6 +177,11 @@ namespace sgpem
     typedef std::vector<SimulationObserver*> RegisteredObservers;
     RegisteredObservers _observers;
 
+    Simulation(); // Constructor
+
+    void notify_change();
+
+  private:
     /** \brief Enable/disable notifications to registered observers
      *
      * This is quite useful to disable momentarily notification while you
@@ -187,11 +192,6 @@ namespace sgpem
      */
     bool  set_notify_enabled(bool enabled = true);
 
-    Simulation(); // Constructor
-
-    void notify_change();
-
-  private:
     bool _notify;
   }; //~ class Simulation
 
@@ -201,6 +201,8 @@ namespace sgpem
    * Simulation that would reset it / notify its observers. For example, when loading
    * from a file. In this case, create an object of this type on the stack.
    * The destructor will take care of re-enabling notifications.
+   *
+   * Locks can be taken recursively without fear.
    */
   class SG_DLLEXPORT Simulation::LockNotify
   {