--- a/dataset.py	Wed Jun 11 16:28:09 2008 -0400
+++ b/dataset.py	Wed Jun 11 16:40:47 2008 -0400
@@ -99,13 +99,24 @@
     of examples) can be extracted. These operations are not supported
     by default in the case of streams.
 
-     - dataset[:n] returns a dataset with the n first examples.
+     - dataset[:n] returns an Example with the n first examples.
 
-     - dataset[i1:i2:s] returns a dataset with the examples i1,i1+s,...i2-s.
+     - dataset[i1:i2:s] returns an Example with the examples i1,i1+s,...i2-s.
 
      - dataset[i] returns an Example.
 
-     - dataset[[i1,i2,...in]] returns a dataset with examples i1,i2,...in.
+     - dataset[[i1,i2,...in]] returns a. Example with examples i1,i2,...in.
+
+    A similar command gives you a DataSet instead of Examples :
+
+     - dataset.subset[:n] returns a DataSet with the n first examples.
+
+     - dataset.subset[i1:i2:s] returns a DataSet with the examples i1,i1+s,...i2-s.
+
+     - dataset.subset[i] returns a DataSet.
+
+     - dataset.subset[[i1,i2,...in]] returns a DataSet with examples i1,i2,...in.
+
 
      - dataset.<property> returns the value of a property associated with
      the name <property>. The following properties should be supported: