Issue #21055: Index (augmented) assignment symbols.
diff --git a/Doc/reference/simple_stmts.rst b/Doc/reference/simple_stmts.rst
index b710cd4..66c234c 100644
--- a/Doc/reference/simple_stmts.rst
+++ b/Doc/reference/simple_stmts.rst
@@ -70,6 +70,7 @@
 =====================
 
 .. index::
+   single: =; assignment statement
    pair: assignment; statement
    pair: binding; name
    pair: rebinding; name
@@ -260,6 +261,18 @@
 .. index::
    pair: augmented; assignment
    single: statement; assignment, augmented
+   single: +=; augmented assignment
+   single: -=; augmented assignment
+   single: *=; augmented assignment
+   single: /=; augmented assignment
+   single: %=; augmented assignment
+   single: &=; augmented assignment
+   single: ^=; augmented assignment
+   single: |=; augmented assignment
+   single: **=; augmented assignment
+   single: //=; augmented assignment
+   single: >>=; augmented assignment
+   single: <<=; augmented assignment
 
 Augmented assignment is the combination, in a single statement, of a binary
 operation and an assignment statement: