diff --git a/crates/ruff_linter/src/rules/ruff/rules/none_not_at_end_of_union.rs b/crates/ruff_linter/src/rules/ruff/rules/none_not_at_end_of_union.rs
index a040bc9618..d69c9cd567 100644
--- a/crates/ruff_linter/src/rules/ruff/rules/none_not_at_end_of_union.rs
+++ b/crates/ruff_linter/src/rules/ruff/rules/none_not_at_end_of_union.rs
@@ -11,7 +11,7 @@ use crate::checkers::ast::Checker;
 /// Checks for type annotations where `None` is not at the end of an union.
 ///
 /// ## Why is this bad?
-/// Type annotation unions are associative, meaning that the order of the elements
+/// Type annotation unions are commutative, meaning that the order of the elements
 /// does not matter. The `None` literal represents the absence of a value. For
 /// readability, it's preferred to write the more informative type expressions first.
 ///