-option is currently only available under NetBSD, and then only if both
-the kernel and pppd were compiled with PPP_FILTER defined.
+option is currently only available under NetBSD or Linux, and then
+only if both the kernel and pppd were compiled with PPP_FILTER defined.
+.TP
+.B password \fIpassword-string
+Specifies the password to use for authenticating to the peer. Use
+of this option is discouraged, as the password is likely to be visible
+to other users on the system (for example, by using ps(1)).