Improve grammar in docs

Fixes #1629

diff --git a/docs/guide/intro.rst b/docs/guide/intro.rst
index ba28c773b3431f313318717a26969db5bb34b195..d5b975d556e3cca1c6ed3969cb90f5efc74325ac 100644 (file)
--- a/docs/guide/intro.rst
+++ b/docs/guide/intro.rst
@@ -15,9 +15,9 @@ Tornado can be roughly divided into four major components:
   create web applications, and various supporting classes).
 * Client- and server-side implementions of HTTP (`.HTTPServer` and
   `.AsyncHTTPClient`).
-* An asynchronous networking library (`.IOLoop` and `.IOStream`),
-  which serve as the building blocks for the HTTP components and can
-  also be used to implement other protocols.
+* An asynchronous networking library including the classes `.IOLoop`
+  and `.IOStream`, which serve as the building blocks for the HTTP
+  components and can also be used to implement other protocols.
 * A coroutine library (`tornado.gen`) which allows asynchronous
   code to be written in a more straightforward way than chaining
   callbacks.