README.md in filegen-0.3.1 vs README.md in filegen-0.4.0

@@ -24,11 +24,11 @@
     $ gem install filegen
 
 This gem ships with an executable called `filegen`. It makes the power of ERB
 available on the commandline.
 
-## Usage
+## Usage on Commandline
 
 ### General advice
 
 Please make sure you have an ERB-template available. It needs to end with
 `.erb`! Place in anywhere you like. It's important that the name of variable in
@@ -125,10 +125,52 @@
 
 ```text
 Hello my name is: Karl
 ```
 
+## Usage within ruby
+
+### Hash with Symbol-Keys
+
+```ruby
+require 'filegen'
+require 'stringio'
+
+template = <<-EOS
+Hi <%= lookup('name') %>
+EOS
+
+data = {
+  name: 'Karl'
+}
+
+generator = Filegen::Rubygen.new
+puts generator.run(template, data)
+
+# => Hi Karl
+```
+
+### Hash with String-Keys
+
+```ruby
+require 'filegen'
+require 'stringio'
+
+template = <<-EOS
+Hi <%= lookup('name') %>
+EOS
+
+data = {
+  'name' => 'Karl'
+}
+
+generator = Filegen::Rubygen.new
+puts generator.run(template, data)
+
+# => Hi Karl
+```
+
 ## Use Cases
 
 ### RPM packaging
 
 Say you would like to package a ruby-based application for a rpm-based
@@ -160,11 +202,10 @@
 chmod +x <wrapper>
 ```
 
 ## Future
 
-* Maybe I will add additional data sources. Please see the
-  [Moneta](https://github.com/minad/moneta)-gem for possible candidates.
+* Maybe I will add additional data sources.
 
 ## Contributing
 
 Please have a look at the {file:README.DEVELOPER.md developer readme}