1 files changed, 17 insertions, 3 deletions
diff --git a/lib/sqlalchemy/dialects/mysql/expression.py b/lib/sqlalchemy/dialects/mysql/expression.py
index 7a66e9b14..77b985b6a 100644
--- a/lib/sqlalchemy/dialects/mysql/expression.py
+++ b/lib/sqlalchemy/dialects/mysql/expression.py
@@ -1,3 +1,11 @@
+# Copyright (C) 2005-2021 the SQLAlchemy authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: https://www.opensource.org/licenses/mit-license.php
+
+import typing
+
 from ... import exc
 from ... import util
 from ...sql import coercions
@@ -8,6 +16,9 @@ from ...sql.base import _generative
 from ...sql.base import Generative
 
 
+Selfmatch = typing.TypeVar("Selfmatch", bound="match")
+
+
 class match(Generative, elements.BinaryExpression):
     """Produce a ``MATCH (X, Y) AGAINST ('TEXT')`` clause.
 
@@ -99,7 +110,7 @@ class match(Generative, elements.BinaryExpression):
         )
 
     @_generative
-    def in_boolean_mode(self):
+    def in_boolean_mode(self: Selfmatch) -> Selfmatch:
         """Apply the "IN BOOLEAN MODE" modifier to the MATCH expression.
 
         :return: a new :class:`_mysql.match` instance with modifications
@@ -107,9 +118,10 @@ class match(Generative, elements.BinaryExpression):
         """
 
         self.modifiers = self.modifiers.union({"mysql_boolean_mode": True})
+        return self
 
     @_generative
-    def in_natural_language_mode(self):
+    def in_natural_language_mode(self: Selfmatch) -> Selfmatch:
         """Apply the "IN NATURAL LANGUAGE MODE" modifier to the MATCH
         expression.
 
@@ -118,9 +130,10 @@ class match(Generative, elements.BinaryExpression):
         """
 
         self.modifiers = self.modifiers.union({"mysql_natural_language": True})
+        return self
 
     @_generative
-    def with_query_expansion(self):
+    def with_query_expansion(self: Selfmatch) -> Selfmatch:
         """Apply the "WITH QUERY EXPANSION" modifier to the MATCH expression.
 
         :return: a new :class:`_mysql.match` instance with modifications
@@ -128,3 +141,4 @@ class match(Generative, elements.BinaryExpression):
         """
 
         self.modifiers = self.modifiers.union({"mysql_query_expansion": True})
+        return self