bootstrap: document stdin

diff --git a/mr b/mr
index d59dc39299cec62bcc44e2c55e92f1a14969bde9..dba54cc63142a63e1a497db380f67e82bb3565b4 100755 (executable)
--- a/mr
+++ b/mr
@@ -152,6 +152,11 @@ C<ssh://[user@]host:file>.
 
 You can retrieve the config file by other means and pass its B<path> as C<src>.
 
+=item standard input
+
+If source C<src> consists in a single dash C<->, config file is read from
+standard input.
+
 =back
 
 The directory will be created if it does not exist. If no directory is