diff --git a/Doc/library/operator.rst b/Doc/library/operator.rst
index e8e71068dd99eb..0070a5466ca6ca 100644
--- a/Doc/library/operator.rst
+++ b/Doc/library/operator.rst
@@ -220,6 +220,8 @@ Operations which work with sequences (some of them with mappings too) include:
               __concat__(a, b)
 
    Return ``a + b`` for *a* and *b* sequences.
+   (Note that there is no :meth:`!__concat__` method.
+   Instead, the :meth:`~object.__add__` method is called.)
 
 
 .. function:: contains(a, b)
@@ -519,6 +521,8 @@ will perform the update, so no subsequent assignment is necessary:
               __iconcat__(a, b)
 
    ``a = iconcat(a, b)`` is equivalent to ``a += b`` for *a* and *b* sequences.
+   (Note that there is no :meth:`!__iconcat__` method.
+   Instead, the :meth:`~object.__iadd__` method is called.)
 
 
 .. function:: ifloordiv(a, b)