diff --git a/Documentation/git-send-email.txt b/Documentation/git-send-email.txt
index e2437f30ca..3c3e1b0e77 100644
--- a/Documentation/git-send-email.txt
+++ b/Documentation/git-send-email.txt
@@ -179,6 +179,9 @@ user is prompted for a password while the input is masked for privacy.
 	This is useful if your default address is not the address that is
 	subscribed to a list. If you use the sendmail binary, you must have
 	suitable privileges for the -f parameter.
+	Default is the value of the 'sendemail.envelopesender' configuration
+	variable; if that is unspecified, choosing the envelope sender is left
+	to your MTA.
 
 --to::
 	Specify the primary recipient of the emails generated.