diff --git a/guides/building-a-middleware-from-scratch.md b/guides/building-a-middleware-from-scratch.md
index 6a47ac11..6bbfb66a 100644
--- a/guides/building-a-middleware-from-scratch.md
+++ b/guides/building-a-middleware-from-scratch.md
@@ -323,7 +323,7 @@ where
         // long and we have to return an error.
         match this.sleep.poll(cx) {
             Poll::Ready(()) => {
-                // Our time is up, but error do we return?!
+                // Our time is up, but what error do we return?!
                 todo!()
             }
             Poll::Pending => {
@@ -377,7 +377,7 @@ and can use `match` to get at the exact error, the approach has three issues:
 1. In practice its common to nest lots of middleware. That would make the final
    error enum very large. Its not unlikely to look something like
    `BufferError<RateLimitError<TimeoutError<MyError>>>`. Pattern matching on
-   such a type (to for example determine if the error is retry-able) is very
+   such a type (to, for example, determine if the error is retry-able) is very
    tedious.
 2. If we change the order our middleware are applied in we also change the final
    error type meaning we have to update our pattern matches.