README.md in qonfig-0.9.0 vs README.md in qonfig-0.10.0

@@ -20,10 +20,11 @@
 ```
 
 ## Usage
 
 - [Definition and Settings Access](#definition-and-access)
+- [Dynamic value calculation](???)
 - [Configuration](#configuration)
 - [Inheritance](#inheritance)
 - [Composition](#composition)
 - [Hash representation](#hash-representation)
 - [Config reloading](#config-reloading) (reload config definitions and option values)
@@ -96,9 +97,15 @@
 # get a hash slice of setting options (and fail when the required key does not exist)
 config.slice(:vendor_api) # => { 'vendor_api' => { 'host' => 'app_service', 'user' => 'test_user' } }
 config.slice(:vendor_api, :user) # => { 'user' => 'test_user' }
 config.slice(:project_api) # => Qonfig::UnknownSettingError # (key does not exist)
 config.slice(:vendor_api, :port) # => Qonfig::UnknownSettingError # (key does not exist)
+
+# get value from the slice of setting options using the given key set (and fail when the required key does not exist) (works in slice manner)
+config.slice_value(:vendor_api) # => { 'host' => 'app_service', 'user' => 'test_user' }
+config.slice_value(:vendor_api, :user) # => 'test_user'
+config.slice_value(:project_api) # => Qonfig::UnknownSettingError # (key does not exist)
+config.slice_value(:vendor_api, :port) # => Qonfig::UnknownSettingError # (key does not exist)
 ```
 
 ---
 
 ### Configuration