"""Category Theory module.

Provides some of the fundamental category-theory-related classes,
including categories, morphisms, diagrams.  Functors are not
implemented yet.
"""

from baseclasses import Object, Morphism

@@ -1,11 +1,12 @@
 %22%22%22
+%0A
 Category
@@ -166,16 +166,314 @@
 ed yet.%0A
+%0AThe general reference work this module tries to follow is%0A%0A  %5BJoyOfCats%5D J. Adamek, H. Herrlich. G. E. Strecker: Abstract and%0A              Concrete Categories. The Joy of Cats.%0A%0AThe latest version of this book should be available for free download%0Afrom%0A%0A   katmat.math.uni-bremen.de/acc/acc.pdf%0A%0A
 %22%22%22%0A%0Afro

Update the comment in __init__.py to include the principal reference.