README.rdoc in davidrichards-data_frame-0.0.15 vs README.rdoc in davidrichards-data_frame-0.0.17

@@ -73,9 +73,24 @@
   > new_data_frame.items
   # => [[24, 6], [24, 6], [24, 6], [24, 6], ...]
 
 
 Note: most of these transformations are not optimized.  I'll work with things for a while before I try to optimize this library.  However, I should say that I've used some fairly large data sets (thousands of rows) and have been fine with things so far.
+
+== Models
+
+Data Frame can now create sub-models:
+
+	>> df = DataFrame.from_csv('http://archive.ics.uci.edu/ml/machine-learning-databases/forest-fires/forestfires.csv')
+	=> DataFrame rows: 517 labels: [:x, :y, :month, :day, :ffmc, :dmc, :dc, :isi, :temp, :rh, :wind, :rain, :area]
+	>> df.model(:weekend) do |m|
+	?> m.day %w(sat sun)
+	>> end
+	=> DataFrame rows: 179 labels: [:x, :y, :month, :day, :ffmc, :dmc, :dc, :isi, :temp, :rh, :wind, :rain, :area]
+	>> df.models.weekend.day.uniq
+	=> ["sat", "sun"]
+	>> df.models
+	=> #<OpenStruct weekend=DataFrame rows: 179 labels: [:x, :y, :month, :day, :ffmc, :dmc, :dc, :isi, :temp, :rh, :wind, :rain, :area]>
   
 ==Installation
 
 sudo gem install davidrichards-data_frame
 
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