Note that distinct argument patterns can be cached separately (GH-9298)
diff --git a/Doc/library/functools.rst b/Doc/library/functools.rst
index 1b94f33..214d573 100644
--- a/Doc/library/functools.rst
+++ b/Doc/library/functools.rst
@@ -85,6 +85,11 @@
Since a dictionary is used to cache results, the positional and keyword
arguments to the function must be hashable.
+ Distinct argument patterns may be considered to be distinct calls with
+ separate cache entries. For example, `f(a=1, b=2)` and `f(b=2, a=1)`
+ differ in their keyword argument order and may have two separate cache
+ entries.
+
If *maxsize* is set to ``None``, the LRU feature is disabled and the cache can
grow without bound. The LRU feature performs best when *maxsize* is a
power-of-two.