diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index a6ca55dafe5365..1239af9363055c 100644
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -1744,6 +1744,10 @@ returns a boolean value regardless of the type of its argument
 Assignment expressions
 ======================
 
+.. index::
+   operator: :=
+   operator: walrus
+
 .. productionlist:: python-grammar
    assignment_expression: [`identifier` ":="] `expression`