diff --git a/yesod-core/Yesod/Core/Class/Yesod.hs b/yesod-core/Yesod/Core/Class/Yesod.hs
index 1286caee..61b5d939 100644
--- a/yesod-core/Yesod/Core/Class/Yesod.hs
+++ b/yesod-core/Yesod/Core/Class/Yesod.hs
@@ -266,7 +266,7 @@ class RenderRoute site => Yesod site where
     -- Default: the 'defaultYesodMiddleware' function.
     --
     -- Since: 1.1.6
-    yesodMiddleware :: HandlerT site IO res -> HandlerT site IO res
+    yesodMiddleware :: ToTypedContent res => HandlerT site IO res -> HandlerT site IO res
     yesodMiddleware = defaultYesodMiddleware
 
 -- | Default implementation of 'yesodMiddleware'. Adds the response header
diff --git a/yesod/Yesod/Default/Config.hs b/yesod/Yesod/Default/Config.hs
index 5519bfdc..12ac5cc3 100644
--- a/yesod/Yesod/Default/Config.hs
+++ b/yesod/Yesod/Default/Config.hs
@@ -214,7 +214,7 @@ loadConfig (ConfigSettings env parseExtra getFile getObject) = do
                 Nothing -> fail $ "Not found: " ++ show k
 
 -- | Loads the configuration block in the passed file named by the
---   passed environment, yeilds to the passed function as a mapping.
+--   passed environment, yields to the passed function as a mapping.
 --
 --   Errors in the case of a bad load or if your function returns
 --   @Nothing@.