--- a/cygwin.rst	Tue Jan 24 17:22:05 2017 +0200
+++ b/cygwin.rst	Tue Jan 24 17:58:00 2017 +0200
@@ -57,7 +57,8 @@
 * 32-bit ftp://www.fruitbat.org/pub/cygwin/setup/snapshots/setup-x86-2.874.exe
 * 64-bit ftp://www.fruitbat.org/pub/cygwin/setup/snapshots/setup-x86_64-2.874.exe
 
-Run as::
+Run as (``-X`` disable signature verification, ``-s <url>`` option select a
+particular mirror, ``-O`` option disallow any other mirrors)::
 
   cmd> setup-x86.exe -X -s ftp://www.fruitbat.org/pub/cygwin/circa/2016/08/30/104223 -O