man: document the notmuch --config=FILE global option

diff --git a/man/man1/notmuch.1 b/man/man1/notmuch.1
index e645a351fe3c8c35d81a0f4d6e66ab802d0d2d48..923fefecb247731ba36de9dc1eb45854800f4174 100644 (file)
--- a/man/man1/notmuch.1
+++ b/man/man1/notmuch.1
@@ -70,6 +70,15 @@ Print a synopsis of available commands and exit.
 Print the installed version of notmuch, and exit.
 .RE
 
+.RS 4
+.TP 4
+.B \-\-config=FILE
+
+Specify the configuration file to use. This overrides any
+configuration file specified by ${NOTMUCH_CONFIG}.
+
+.RE
+
 .SH COMMANDS