--- gtkmm-documentation-2.23.0/docs/tutorial/C/gtkmm-tutorial-in.xml.orig2	2011-03-29 17:31:43.000000000 +0100
+++ gtkmm-documentation-2.23.0/docs/tutorial/C/gtkmm-tutorial-in.xml	2011-03-29 17:48:34.000000000 +0100
@@ -7422,9 +7422,9 @@
 global lock, as invoked by <function>gdk_threads_enter()</function>
 and <function>gdk_threads_leave()</function>, so as to address GTK+ in
 more than one thread, because of <application>libsigc++</application>
-this will not usually work with &gtkmm;.  Instead, if a worker thread
-needs to invoke a &gtkmm; function, it should do so via
-<classname>Glib::Dispatcher</classname>.
+this will not usually work with &gtkmm; where trackability is
+employed.  Instead, if a worker thread needs to invoke a &gtkmm;
+function, it should do so via <classname>Glib::Dispatcher</classname>.
 <classname>Glib::Dispatcher</classname> is the key to writing
 successful multi-threaded code using <application>glibmm</application>
 and &gtkmm;, and is dealt with in more detail in the next section.
@@ -7441,9 +7441,10 @@
 by the thread which created it.  Only that thread should connect slots
 with respect to the signal object, and only that thread should
 <methodname>emit()</methodname> or call
-<methodname>operator()()</methodname> on it.  It follows (amongst
-other things) that any signal object provided by a &gtkmm; widget
-should only be operated on in the main GUI thread.
+<methodname>operator()()</methodname> on it, or null any of the
+connected slots.  It follows (amongst other things) that without
+additional synchronization any signal object provided by a &gtkmm;
+widget should only be operated on in the main GUI thread.
 </para>
 </listitem>
 
@@ -7478,7 +7479,8 @@
 slots with <function>sigc::mem_fun()</function>).  The first thread to
 create such a slot should be regarded as owning the relevant object
 for the purpose of creating further slots referencing
-<emphasis>any</emphasis> of its non-static methods.
+<emphasis>any</emphasis> of its non-static methods or nulling those
+slots by destroying the trackable object.
 </para>
 </listitem>
 
