diff --git a/doc/tomb.1 b/doc/tomb.1
index 196b4e9..0feeab4 100644
--- a/doc/tomb.1
+++ b/doc/tomb.1
@@ -100,6 +100,8 @@ of the  key to use. Keys  are created with  the same name of  the tomb
 file adding a '.gpg' suffix,  but can be later renamed and transported
 on other media. When a key is  not found, the program asks to insert a
 USB storage device and it will look for the key file inside it.
+If \fI<keyfile>\fR is "-" (dash), it will read stdin
+.IP
 When creating a tomb, this option can be used to specify the name (and
 location) of the key you are creating. For example, you could use
 .EX