diff --git a/agency.rb b/agency.rb
index a297fc8..b81a6bb 100755
--- a/agency.rb
+++ b/agency.rb
@@ -65,7 +65,10 @@ def create_managers
     def create_middlewares
       instance_list = []
       @middleware = configuration.middlewares.inject(nil) do |app, (klass, args, kwargs, config)|
-        klass.new(app, *args, **kwargs, &config).tap{ |inst| instance_list << inst }
+        klass.new(app, *args, **kwargs, &config).tap do |inst|
+          instance_list << inst
+          klass.installed(self)
+        end
       end
       # Some Middlewares will use background threads to process work. By
       # sleeping for a short time between checks, those threads can work
diff --git a/middleware.rb b/middleware.rb
index 5eb32f5..bbf7f87 100755
--- a/middleware.rb
+++ b/middleware.rb
@@ -40,6 +40,17 @@ def self.register_handler namespace, event, &handler
     end
 
 
+    # A callback to be run when a Middleware instance of this type is
+    # installed in an Agency.
+    def self.on_install &block
+      @installed_callback = block
+    end
+
+    def self.installed agency
+      @installed_callback&.call(agency)
+    end
+
+
     attr_accessor :app, :storage