README.md in metasploit-concern-0.0.4 vs README.md in metasploit-concern-0.1.0

@@ -116,6 +116,18 @@
         has_many :widgets,
                  class_name: 'Widget',
                  dependent: :destroy,
                  inverse_of :gem_namespace_gem_class
       end
-    end
\ No newline at end of file
+    end
+    
+### initializers
+
+`Metasploit::Concern::Engine` defines the `'metasploit_concern.load_concerns'` initializer, which sets up
+`ActiveSupport.on_load` callbacks.  If you depend on a feature from a concern in your initializers, it is best to have
+the initializer declare that it needs to be run after `'metasploit_concern.load_concerns`:
+
+    initializer 'application_or_engine_namespace.depends_on_concerns', after: 'metasploit_concern.load_concerns' do
+      if GemNamespace::GemClass.primary.widgets.empty?
+        logger.info('No Widgets on the primary GemClass!')
+      end
+    end