typechk for instmethods

docs/coding/typechecking.md

@@ -5,4 +5,16 @@ Satella typechecking is a complex solution for:
 * checking type compatibility at runtime
 
 If you do `@typed` on a class method, skip the type of self or cls, since Satella will
-detect that it's annotating a class method.
+detect that it's annotating a class method.
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+
+## Typechecking instance methods
+
+If you need to use `@typed` for instancemethods, do the following:
+
+```python
+class Cheese(object):
+
+    @typed('self', int, int):
+    def add_two_ints(self, a, b):
+        return a+b
+```
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