--- a/genshi/template/eval.py
+++ b/genshi/template/eval.py
@@ -38,7 +38,7 @@
     """Abstract base class for the `Expression` and `Suite` classes."""
     __slots__ = ['source', 'code', 'ast', '_globals']
 
-    def __init__(self, source, filename=None, lineno=-1, lookup='lenient',
+    def __init__(self, source, filename=None, lineno=-1, lookup='strict',
                  xform=None):
         """Create the code object, either from a string, or from an AST node.
         
@@ -48,8 +48,8 @@
                          the code
         :param lineno: the number of the line on which the code was found
         :param lookup: the lookup class that defines how variables are looked
-                       up in the context. Can be either `LenientLookup` (the
-                       default), `StrictLookup`, or a custom lookup class
+                       up in the context; can be either "strict" (the default),
+                       "lenient", or a custom lookup class
         :param xform: the AST transformer that should be applied to the code;
                       if `None`, the appropriate transformation is chosen
                       depending on the mode