diff --git a/Doc/library/pprint.rst b/Doc/library/pprint.rst
index 3922a76..deadf18 100644
--- a/Doc/library/pprint.rst
+++ b/Doc/library/pprint.rst
@@ -30,6 +30,8 @@
 .. First the implementation class:
 
 
+.. index:: single: ...; placeholder
+
 .. class:: PrettyPrinter(indent=1, width=80, depth=None, stream=None, *, \
                          compact=False)
 
diff --git a/Doc/library/reprlib.rst b/Doc/library/reprlib.rst
index 5149bcf..1a0c1b0 100644
--- a/Doc/library/reprlib.rst
+++ b/Doc/library/reprlib.rst
@@ -42,6 +42,9 @@
 detecting recursive calls to :meth:`__repr__` and substituting a placeholder
 string instead.
 
+
+.. index:: single: ...; placeholder
+
 .. decorator:: recursive_repr(fillvalue="...")
 
    Decorator for :meth:`__repr__` methods to detect recursive calls within the
diff --git a/Doc/library/textwrap.rst b/Doc/library/textwrap.rst
index 438007d..d254466 100644
--- a/Doc/library/textwrap.rst
+++ b/Doc/library/textwrap.rst
@@ -268,6 +268,8 @@
       .. versionadded:: 3.4
 
 
+   .. index:: single: ...; placeholder
+
    .. attribute:: placeholder
 
       (default: ``' [...]'``) String that will appear at the end of the output