diff --git a/servant-matrix-param.cabal b/servant-matrix-param.cabal
--- a/servant-matrix-param.cabal
+++ b/servant-matrix-param.cabal
@@ -1,5 +1,5 @@
 name:           servant-matrix-param
-version:        0.3.2
+version:        0.3.3
 synopsis:       Matrix parameter combinator for servant
 description:    Matrix parameter combinator for servant
 category:       Web
diff --git a/src/Servant/MatrixParam/Client/Internal.hs b/src/Servant/MatrixParam/Client/Internal.hs
--- a/src/Servant/MatrixParam/Client/Internal.hs
+++ b/src/Servant/MatrixParam/Client/Internal.hs
@@ -72,6 +72,25 @@
       key = symbolVal (Proxy :: Proxy k)
 
 instance
+  ( HasClient (WMP rest :> api)
+  , KnownSymbol k
+  ) => HasClient (WMP (MatrixFlag k ': rest) :> api) where
+
+  type Client (WMP (MatrixFlag k ': rest) :> api)
+    = Bool -> Client (WMP rest :> api)
+
+  clientWithRoute Proxy req flag
+    | flag = clientWithRoute nextProxy
+        req { reqPath = reqPath req ++ ";" ++ key }
+    | otherwise = clientWithRoute nextProxy req
+    where
+      nextProxy :: Proxy (WMP rest :> api)
+      nextProxy = Proxy
+
+      key :: String
+      key = symbolVal (Proxy :: Proxy k)
+
+instance
   ( HasClient api
   ) => HasClient (WMP '[] :> api) where
 
diff --git a/test/Servant/MatrixParam/ClientSpec.hs b/test/Servant/MatrixParam/ClientSpec.hs
--- a/test/Servant/MatrixParam/ClientSpec.hs
+++ b/test/Servant/MatrixParam/ClientSpec.hs
@@ -48,20 +48,23 @@
       cliB Nothing Nothing `hasRequestPath` "/b"
 
     it "can be combined with captures" $ do
-      cliC 5 (Just 3) Nothing `hasRequestPath` "/5;foo=3"
+      cliC 5 (Just 3) False `hasRequestPath` "/5;foo=3"
 
+    it "supports matrix flags" $ do
+      cliC 5 (Just 3) True `hasRequestPath` "/5;foo=3;bool"
 
+
 #if MIN_VERSION_servant_client(0,9,0)
     it "generates paths that servant-server understands" $ do
       testWithApplication (return $ serve api server) $ \port -> do
         let res = (,,) <$> cliA (Just "There is a there there")
                        <*> cliB (Just 1) (Just 2)
-                       <*> cliC 5 (Just 1) (Just 2)
+                       <*> cliC 5 (Just 1) True
 
             url = BaseUrl Http "localhost" port ""
         mgr' <- newManager defaultManagerSettings
         runClientM res (ClientEnv mgr' url)
-          `shouldReturn` Right ("There is a there there", "3", "8")
+          `shouldReturn` Right ("There is a there there", "3", "6")
 #endif
 ------------------------------------------------------------------------------
 -- API
@@ -71,7 +74,7 @@
        WithMatrixParams "a" '[MatrixParam "name" String] :> Get '[JSON] String
   :<|> WithMatrixParams "b" '[MatrixParam "foo" Int, MatrixParam "bar" Int]
          :> Get '[JSON] String
-  :<|> CaptureWithMatrixParams "c" Int '[MatrixParam "foo" Int, MatrixParam "bar" Int]
+  :<|> CaptureWithMatrixParams "c" Int '[MatrixParam "foo" Int, MatrixFlag "bool"]
          :> Get '[JSON] String
 
 api :: Proxy Api
@@ -84,7 +87,9 @@
   where
     e1 name = return $ fromMaybe "" name
     e2 foo bar = return . show $ fromMaybe 0 foo + fromMaybe 0 bar
-    e3 int foo bar = return . show $ int + fromMaybe 0 foo + fromMaybe 0 bar
+    e3 int foo bool
+      | bool      = return . show $ int + fromMaybe 0 foo
+      | otherwise = return ""
 #endif
 
 ------------------------------------------------------------------------------
@@ -131,10 +136,10 @@
 #if MIN_VERSION_servant_client(0,9,0)
 cliA :: Maybe String -> ClientM String
 cliB :: Maybe Int -> Maybe Int -> ClientM String
-cliC :: Int -> Maybe Int -> Maybe Int -> ClientM String
+cliC :: Int -> Maybe Int -> Bool -> ClientM String
 #else
 cliA :: Maybe String -> Manager -> BaseUrl -> ClientM String
 cliB :: Maybe Int -> Maybe Int -> Manager -> BaseUrl -> ClientM String
-cliC :: Int -> Maybe Int -> Maybe Int -> Manager -> BaseUrl -> ClientM String
+cliC :: Int -> Maybe Int -> Bool -> Manager -> BaseUrl -> ClientM String
 #endif
 cliA :<|> cliB :<|> cliC = client api