Another update from Yury for PEP 362.

pep-0362.txt

@@ -160,11 +160,16 @@ The function implements the following algorithm:
 
         - Or else construct a new ``Signature`` object and return it
 
-    - if the object is a method, construct and return a new ``Signature``
-      object, with its first parameter (usually ``self``) removed
+    - if the object is a method or a classmethod, construct and return
+      a new ``Signature`` object, with its first parameter (usually
+      ``self`` or ``cls``) removed
 
     - If the object is a class return ``signature(object.__init__)``
 
+    - If the object is an instance of ``functools.partial``, construct
+      a new ``Signature`` from its ``partial.func`` attribute, and
+      account for already bound ``partial.args`` and ``partial.kwargs``
+
     - Return ``signature(object.__call__)``
 
 Note, that the ``Signature`` object is created in a lazy manner, and