fix sentence

diff --git a/lib/sqlalchemy/ext/declarative.py b/lib/sqlalchemy/ext/declarative.py
index 200b0d6c6e4c5026dd4bab12822e070ebbf9b937..b586854146c22895a522cc64948410b58710ce3b 100755 (executable)
--- a/lib/sqlalchemy/ext/declarative.py
+++ b/lib/sqlalchemy/ext/declarative.py
@@ -466,7 +466,7 @@ New helper classes released in 0.7.3 provides a simpler pattern for concrete inh
 With these objects, the ``__declare_last__`` helper is used to configure the "polymorphic"
 loader for the mapper after all subclasses have been declared.
 
-A basic abstract example of the :class:`.AbstractConcreteBase` class::
+An abstract base can be declared using the :class:`.AbstractConcreteBase` class::
 
     from sqlalchemy.ext.declarative import AbstractConcreteBase