diff --git a/docs/topics/architecture.rst b/docs/topics/architecture.rst
index 71d027c86..0c3a7ed88 100644
--- a/docs/topics/architecture.rst
+++ b/docs/topics/architecture.rst
@@ -67,7 +67,7 @@ this:
    the :ref:`Scheduler <component-scheduler>` and asks for possible next Requests
    to crawl.
 
-9. The process repeats (from step 1) until there are no more requests from the
+9. The process repeats (from step 3) until there are no more requests from the
    :ref:`Scheduler <component-scheduler>`.
 
 Components
diff --git a/docs/topics/asyncio.rst b/docs/topics/asyncio.rst
index 28241ae24..402352721 100644
--- a/docs/topics/asyncio.rst
+++ b/docs/topics/asyncio.rst
@@ -10,11 +10,6 @@ Scrapy has partial support for :mod:`asyncio`. After you :ref:`install the
 asyncio reactor <install-asyncio>`, you may use :mod:`asyncio` and
 :mod:`asyncio`-powered libraries in any :doc:`coroutine <coroutines>`.
 
-.. warning:: :mod:`asyncio` support in Scrapy is experimental, and not yet
-             recommended for production environments. Future Scrapy versions
-             may introduce related changes without a deprecation period or
-             warning.
-
 .. _install-asyncio:
 
 Installing the asyncio reactor
diff --git a/scrapy/core/downloader/webclient.py b/scrapy/core/downloader/webclient.py
index 915cb5fe3..06cb96489 100644
--- a/scrapy/core/downloader/webclient.py
+++ b/scrapy/core/downloader/webclient.py
@@ -3,7 +3,7 @@ from time import time
 from urllib.parse import urlparse, urlunparse, urldefrag
 
 from twisted.web.http import HTTPClient
-from twisted.internet import defer, reactor
+from twisted.internet import defer
 from twisted.internet.protocol import ClientFactory
 
 from scrapy.http import Headers
@@ -170,6 +170,7 @@ class ScrapyHTTPClientFactory(ClientFactory):
         p.followRedirect = self.followRedirect
         p.afterFoundGet = self.afterFoundGet
         if self.timeout:
+            from twisted.internet import reactor
             timeoutCall = reactor.callLater(self.timeout, p.timeout)
             self.deferred.addBoth(self._cancelTimeout, timeoutCall)
         return p