diff --git a/README.md b/README.md
index ecb4bec..6112552 100644
--- a/README.md
+++ b/README.md
@@ -152,12 +152,7 @@ On multi-threaded apps identify which thread are snooped in output:
 
 PySnooper supports decorating generators.
 
-If the decorator is applied to a class, PySnooper will decorate all of its instance methods. If you use this feature, you should be aware
-of the behaviour when snooping on decorated functions:
-
-* If any methods have existing decorators, and those decorators return functions, it is the decorated method that will be snooped.
-* Some decorators do not return functions (rather, they return an instance of a class with a `__call__` method).
-  This includes the `@property` builtin. In these cases, the decorated method will not be snooped at all.
+If you decorate a class with `snoop`, it'll automatically apply the decorator to all the methods. (Not including properties and other special cases.)
 
 You can also customize the repr of an object:
 
diff --git a/pysnooper/tracer.py b/pysnooper/tracer.py
index 0be0bba..6d76685 100644
--- a/pysnooper/tracer.py
+++ b/pysnooper/tracer.py
@@ -225,7 +225,7 @@ class Tracer:
 
     def __call__(self, function_or_class):
         if DISABLED:
-            return function
+            return function_or_class
 
         if inspect.isclass(function_or_class):
             return self._wrap_class(function_or_class)