#16128: clarify that instances of user-defined classes compare equal with themselves.
diff --git a/Doc/glossary.rst b/Doc/glossary.rst
index 198933b..3641e5c 100644
--- a/Doc/glossary.rst
+++ b/Doc/glossary.rst
@@ -330,7 +330,8 @@
All of Python's immutable built-in objects are hashable, while no mutable
containers (such as lists or dictionaries) are. Objects which are
instances of user-defined classes are hashable by default; they all
- compare unequal, and their hash value is their :func:`id`.
+ compare unequal (except with themselves), and their hash value is their
+ :func:`id`.
IDLE
An Integrated Development Environment for Python. IDLE is a basic editor