diff --git a/docs/topics/settings.rst b/docs/topics/settings.rst
index a9eba41ce..9afb504cc 100644
--- a/docs/topics/settings.rst
+++ b/docs/topics/settings.rst
@@ -341,6 +341,7 @@ Default::
         'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware': 400,
         'scrapy.downloadermiddlewares.retry.RetryMiddleware': 500,
         'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware': 550,
+        'scrapy.downloadermiddlewares.ajaxcrawl.AjaxCrawlMiddleware': 560,
         'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware': 580,
         'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware': 590,
         'scrapy.downloadermiddlewares.redirect.RedirectMiddleware': 600,