diff --git a/docs/faq.rst b/docs/faq.rst
index 69edb0993..7105baeef 100644
--- a/docs/faq.rst
+++ b/docs/faq.rst
@@ -129,13 +129,23 @@ Does Scrapy crawl in breadth-first or depth-first order?
 
 By default, Scrapy uses a `LIFO`_ queue for storing pending requests, which
 basically means that it crawls in `DFO order`_. This order is more convenient
-in most cases. If you do want to crawl in true `BFO order`_, you can do it by
+in most cases.
+
+If you do want to crawl in true `BFO order`_, you can do it by
 setting the following settings::
 
     DEPTH_PRIORITY = 1
     SCHEDULER_DISK_QUEUE = 'scrapy.squeues.PickleFifoDiskQueue'
     SCHEDULER_MEMORY_QUEUE = 'scrapy.squeues.FifoMemoryQueue'
 
+While pending requests are below the configured values of
+:setting:`CONCURRENT_REQUESTS`, :setting:`CONCURRENT_REQUESTS_PER_DOMAIN` or
+:setting:`CONCURRENT_REQUESTS_PER_DOMAIN`, those requests are sent
+concurrently. As a result, the first few requests of a crawl rarely follow the
+desired order. Lowering those settings to ``1`` enforces the desired order, but
+it significantly slows down the crawl as a whole.
+
+
 My Scrapy crawler has memory leaks. What can I do?
 --------------------------------------------------