diff --git a/README.md b/README.md
index d979634c..efea9fa9 100644
--- a/README.md
+++ b/README.md
@@ -154,6 +154,22 @@ Example production environment config file:
 #{Rails.root}/config/environments/production.yml
 ```
 
+### Extra sources
+
+You can load extra sources during initialization by setting the `extra_sources` configuration option.
+
+```ruby
+Config.setup do |config|
+  config.extra_sources = [
+    'path/to/extra_source.yml',          # String: loads extra_source.yml
+    { api_key: ENV['API_KEY'] },         # Hash: direct hash source
+    MyCustomSource.new,                  # Object: custom source object that responds to `load`
+  ]
+end
+```
+
+This will also overwrite the same config entries from the main file.
+
 ### Developer specific config files
 
 If you want to have local settings, specific to your machine or development environment, you can use the following files, which are automatically `.gitignore` :
diff --git a/lib/config.rb b/lib/config.rb
index e98d1e70..1d9d7207 100644
--- a/lib/config.rb
+++ b/lib/config.rb
@@ -29,7 +29,8 @@ module Config
     merge_hash_arrays: false,
     validation_contract: nil,
     evaluate_erb_in_yaml: true,
-    environment: nil
+    environment: nil,
+    extra_sources: []
   )
 
   def self.setup
@@ -57,7 +58,10 @@ def self.load_files(*sources)
   def self.load_and_set_settings(*sources)
     name = Config.const_name
     Object.send(:remove_const, name) if Object.const_defined?(name)
-    Object.const_set(name, Config.load_files(sources))
+
+    # Include extra sources in the loading process
+    all_sources = [sources, Config.extra_sources].flatten.compact
+    Object.const_set(name, Config.load_files(*all_sources))
   end
 
   def self.setting_files(config_root, env)
diff --git a/lib/generators/config/templates/config.rb b/lib/generators/config/templates/config.rb
index f6a222d0..ddd591da 100644
--- a/lib/generators/config/templates/config.rb
+++ b/lib/generators/config/templates/config.rb
@@ -65,4 +65,13 @@
   #
   # config.file_name = 'settings'
   # config.dir_name = 'settings'
+
+  # Load extra sources from a path. These can be file paths (strings),
+  # hashes, or custom source objects that respond to 'load'
+  #
+  # config.extra_sources = [
+  #   'path/to/extra_source.yml',          # String: loads extra_source.yml
+  #   { api_key: ENV['API_KEY'] },         # Hash: direct hash source
+  #   MyCustomSource.new,                  # Custom source object
+  # ]
 end
diff --git a/spec/config_env_spec.rb b/spec/config_env_spec.rb
index 99e3e863..5ca3109f 100644
--- a/spec/config_env_spec.rb
+++ b/spec/config_env_spec.rb
@@ -7,7 +7,11 @@
 
   context 'when overriding settings via ENV variables is enabled' do
     let(:config) do
-      Config.load_files "#{fixture_path}/settings.yml", "#{fixture_path}/multilevel.yml"
+      config_instance = Config.load_files "#{fixture_path}/settings.yml", "#{fixture_path}/multilevel.yml"
+      # Ensure the Settings constant is set to the same instance for Config.reload! to work
+      Object.send(:remove_const, 'Settings') if Object.const_defined?('Settings')
+      Object.const_set('Settings', config_instance)
+      config_instance
     end
 
     after :all do
diff --git a/spec/config_spec.rb b/spec/config_spec.rb
index 505c6081..79f8c4e2 100644
--- a/spec/config_spec.rb
+++ b/spec/config_spec.rb
@@ -38,6 +38,30 @@
     expect(config.root['google.com']).to eq(3)
   end
 
+  it "should load extra_sources and support different types" do
+    test_hash = { 'extra_key' => 'extra_value' }
+    object_source = double 'source'
+
+    allow(object_source).to receive(:load) do
+      { 'server' => 'google.com' }
+    end
+
+    Config.setup do |config|
+      config.extra_sources = [
+        "#{fixture_path}/settings2.yml",
+        test_hash,
+        object_source
+      ]
+    end
+
+    Config.load_and_set_settings("#{fixture_path}/settings.yml")
+
+    expect(Settings.size).to eq(1)
+    expect(Settings.extra_key).to eq('extra_value')
+    expect(Settings.another).to eq("something")
+    expect(Settings.server).to eq('google.com')
+  end
+
   it "should load 2 basic config files" do
     config = Config.load_files("#{fixture_path}/settings.yml", "#{fixture_path}/settings2.yml")
     expect(config.size).to eq(1)
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index aff76763..ed84b4cf 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -84,6 +84,18 @@ def fixture_path
 
       # Extend Config module with ability to reset configuration to the default values
       def self.reset
+        # Clear any existing Settings constant and its sources to prevent mock leakage
+        current_const_name = self.const_name
+        if Object.const_defined?(current_const_name)
+          settings_instance = Object.const_get(current_const_name)
+          # Clear the config sources to prevent mock doubles from leaking
+          if settings_instance.respond_to?(:instance_variable_set)
+            settings_instance.instance_variable_set(:@config_sources, [])
+          end
+          Object.send(:remove_const, current_const_name)
+        end
+
+        # Reset configuration to defaults
         self.const_name           = 'Settings'
         self.use_env              = false
         self.knockout_prefix      = nil
@@ -93,6 +105,7 @@ def self.reset
         self.fail_on_missing      = false
         self.file_name            = 'settings'
         self.dir_name             = 'settings'
+        self.extra_sources        = []
         instance_variable_set(:@_ran_once, false)
       end
     end