diff -r c0827842102e Doc/reference/executionmodel.rst
--- a/Doc/reference/executionmodel.rst	Fri Jun 19 13:08:58 2015 -0700
+++ b/Doc/reference/executionmodel.rst	Sat Jun 20 00:43:45 2015 +0200
@@ -144,10 +144,11 @@
 in the same block.  If the nearest enclosing scope for a free variable contains
 a global statement, the free variable is treated as a global.
 
-A class definition is an executable statement that may use and define names.
-These references follow the normal rules for name resolution.  The namespace of
-the class definition becomes the attribute dictionary of the class.  Names
-defined at the class scope are not visible in methods.
+A class definition is an executable statement that may use and define names. 
+These references follow the normal rules for name resolution with one exception.
+Unbound local variables are looked up in the global namespace. 
+The namespace of the class definition becomes the attribute dictionary of 
+the class. Names defined at the class scope are not visible in methods.
 
 
 .. _dynamic-features: