1 files changed, 1 insertions, 0 deletions
diff --git a/coverage/misc.py b/coverage/misc.py
index 329a8417..aa61fc98 100644
--- a/coverage/misc.py
+++ b/coverage/misc.py
@@ -53,6 +53,7 @@ def expensive(fn):
     """
     attr = "_cache_" + fn.__name__
     def _wrapped(self):
+        """Inner fn that checks the cache."""
         if not hasattr(self, attr):
             setattr(self, attr, fn(self))
         return getattr(self, attr)