diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index 1e76b25f4880eb..31cdc5c1e16b45 100644
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -1723,6 +1723,12 @@ returns a boolean value regardless of the type of its argument
 (for example, ``not 'foo'`` produces ``False`` rather than ``''``.)
 
 
+.. index::
+   single: := (colon equals)
+   single: assignment expression
+   single: walrus operator
+   single: named expression
+
 Assignment expressions
 ======================