diff --git a/content/go1.13-errors.article b/content/go1.13-errors.article
index b0f445d..f5ffd84 100644
--- a/content/go1.13-errors.article
+++ b/content/go1.13-errors.article
@@ -135,6 +135,7 @@
 	// Similar to:
 	//   if e, ok := err.(*QueryError); ok { … }
 	var e *QueryError
+	// Note: *QueryError is the type of the error.
 	if errors.As(err, &e) {
 		// err is a *QueryError, and e is set to the error's value
 	}
@@ -160,6 +161,10 @@
 `Unwrap` method. It is usually better to use `errors.Is` or `errors.As`,
 however, since these functions will examine the entire chain in a single call.
 
+Note: although it may feel odd to take a pointer to a pointer, in this case it
+is correct. Think of it instead as taking a pointer to a value of the error
+type; it so happens in this case that the returned error is a pointer type.
+
 ### Wrapping errors with %w
 
 As mentioned earlier, it is common to use the `fmt.Errorf` function to add additional information to an error.