Autogenerated HTML docs for v1.6.4-rc2 
diff --git a/git-send-email.txt b/git-send-email.txt index fbde2d3..d6b192b 100644 --- a/git-send-email.txt +++ b/git-send-email.txt 
@@ -212,11 +212,22 @@ 	value; if that is unspecified, default to --no-suppress-from.    --[no-]thread:: -	If this is set, the In-Reply-To header will be set on each email sent. -	If disabled with "--no-thread", no emails will have the In-Reply-To -	header set, unless specified with --in-reply-to. -	Default is the value of the 'sendemail.thread' configuration -	value; if that is unspecified, default to --thread. +	If this is set, the In-Reply-To and References headers will be +	added to each email sent. Whether each mail refers to the +	previous email (`deep` threading per 'git format-patch' +	wording) or to the first email (`shallow` threading) is +	governed by "--[no-]chain-reply-to". ++ +If disabled with "--no-thread", those headers will not be added +(unless specified with --in-reply-to). Default is the value of the +'sendemail.thread' configuration value; if that is unspecified, +default to --thread. ++ +It is up to the user to ensure that no In-Reply-To header already +exists when 'git send-email' is asked to add it (especially note that +'git format-patch' can be configured to do the threading itself). +Failure to do so may not produce the expected result in the +recipient's MUA.      Administering