-When '--compose' is used, git send-email gets less interactive will use the
-values of the headers you set there. If the body of the email (what you type
-after the headers and a blank line) only contains blank (or GIT: prefixed)
-lines, the summary won't be sent, but git-send-email will still use the
-Headers values if you don't removed them.
+When '--compose' is used, git send-email will use the From, Subject, and
+In-Reply-To headers specified in the message. If the body of the message
+(what you type after the headers and a blank line) only contains blank
+(or GIT: prefixed) lines the summary won't be sent, but From, Subject,
+and In-Reply-To headers will be used unless they are removed.