diff --git a/README.md b/README.md
index 410a1bd..d7eee43 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,17 @@ It then runs `bundle install`.
 
 You can also run `penchant gemfile ENV`.
 
+### After-`gemfile` hooks?
+
+Drop a file called `.penchant` in your project directory. It'll get executed every time you switch environments using
+Penchant. I use it to tell my Hydra clients to sync and update their Gemfiles, too:
+
+``` ruby
+# rake knows if you need "bundle exec" or not.
+
+rake "hydra:sync hydra:remote:bundle"
+```
+
 ### What environment are you currently using in that Gemfile?
 
 `head -n 1` that puppy, or `penchant gemfile-env`.
diff --git a/bin/penchant b/bin/penchant
index 8c49623..a75aa7e 100755
--- a/bin/penchant
+++ b/bin/penchant
@@ -28,7 +28,7 @@ class PenchantCLI < Thor
   def gemfile(env = get_current_env)
     if env
       puts "[penchant] Rebunding for #{env} environment..."
-      !Penchant::Gemfile.do_full_env_switch!(env)
+      Penchant::Gemfile.do_full_env_switch!(env)
     end
 
     gemfile = Penchant::Gemfile.new
diff --git a/lib/penchant.rb b/lib/penchant.rb
index 0dfcd5d..11dd46c 100644
--- a/lib/penchant.rb
+++ b/lib/penchant.rb
@@ -1,3 +1,4 @@
 module Penchant
   autoload :Gemfile, 'penchant/gemfile'
+  autoload :DotPenchant, 'penchant/dot_penchant'
 end
diff --git a/lib/penchant/dot_penchant.rb b/lib/penchant/dot_penchant.rb
new file mode 100644
index 0000000..7174201
--- /dev/null
+++ b/lib/penchant/dot_penchant.rb
@@ -0,0 +1,28 @@
+module Penchant
+  class DotPenchant
+    class << self
+      def run(env = nil)
+        dot_penchant = new
+        dot_penchant.run(env)
+        dot_penchant
+      end
+    end
+
+    def run(env = nil)
+      instance_eval(File.read('.penchant'))
+    end
+
+    def rake(*tasks)
+      command = [ "rake", *tasks ]
+      command.unshift("bundle exec") if gemfile?
+      Kernel.system command.join(' ')
+    end
+
+    private
+    def gemfile?
+      File.file?('Gemfile')
+    end
+
+  end
+end
+
diff --git a/lib/penchant/gemfile.rb b/lib/penchant/gemfile.rb
index d5e6067..502151a 100644
--- a/lib/penchant/gemfile.rb
+++ b/lib/penchant/gemfile.rb
@@ -7,6 +7,8 @@ module Penchant
     class << self
       def do_full_env_switch!(env)
         gemfile = Penchant::Gemfile.new
+        gemfile.run_dot_penchant!(env)
+
         if !gemfile.has_gemfile_erb?
           return false
         end
@@ -27,6 +29,10 @@ module Penchant
       File.file?('Gemfile')
     end
 
+    def has_dot_penchant?
+      File.file?('.penchant')
+    end
+
     def gemfile_erb_path
       file_in_path('Gemfile.erb')
     end
@@ -50,6 +56,10 @@ module Penchant
       end
     end
 
+    def run_dot_penchant!(env)
+      DotPenchant.run(env || environment) if has_dot_penchant?
+    end
+
     private
     def file_in_path(file)
       File.join(@path, file)
diff --git a/spec/lib/penchant/dot_penchant_spec.rb b/spec/lib/penchant/dot_penchant_spec.rb
new file mode 100644
index 0000000..8be4d9e
--- /dev/null
+++ b/spec/lib/penchant/dot_penchant_spec.rb
@@ -0,0 +1,45 @@
+require 'spec_helper'
+
+describe Penchant::DotPenchant do
+  include FakeFS::SpecHelpers
+
+  describe '.run' do
+    before do
+      File.open('.penchant', 'wb') { |fh|
+        fh.puts "@did_run = env"
+      }
+    end
+
+    it 'should run the file in the environment' do
+      dot_file = Penchant::DotPenchant.run(:this)
+
+      dot_file.instance_variable_get(:@did_run).should == :this
+    end
+  end
+
+  let(:dot_file) { described_class.new }
+
+  describe '#rake' do
+    context 'without Gemfile' do
+      before do
+        Kernel.expects(:system).with('rake task1 task2')
+      end
+
+      it 'should run the rake task via system' do
+        dot_file.rake("task1", "task2")
+      end
+    end
+
+    context 'with Gemfile' do
+      before do
+        File.open('Gemfile', 'wb')
+        Kernel.expects(:system).with('bundle exec rake task1 task2')
+      end
+
+      it 'should run the rake task via system' do
+        dot_file.rake("task1", "task2")
+      end
+    end
+  end
+end
+
diff --git a/spec/lib/penchant/gemfile_spec.rb b/spec/lib/penchant/gemfile_spec.rb
index cc22c51..6b4d27b 100644
--- a/spec/lib/penchant/gemfile_spec.rb
+++ b/spec/lib/penchant/gemfile_spec.rb
@@ -103,6 +103,20 @@ ERB
         File.read('Gemfile').should_not include('not')
         File.read('Gemfile').should include('all')
       end
+
+      it { should_not have_dot_penchant }
+
+      context 'with .penchant' do
+        before do
+          File.open('.penchant', 'wb')
+        end
+
+        it { should have_dot_penchant }
+
+        it 'should process the file' do
+          subject.switch_to!(:not)
+        end
+      end
     end
   end
 end