diff --git a/unix/vncpasswd/vncpasswd.man b/unix/vncpasswd/vncpasswd.man
index e9250fd..a62c0ed 100644
--- a/unix/vncpasswd/vncpasswd.man
+++ b/unix/vncpasswd/vncpasswd.man
@@ -32,6 +32,9 @@
 version to stdout.  Note that in filter mode, short or even empty passwords
 will be silently accepted.
 
+A view-only password must be separated from the normal password by a newline
+character.
+
 
 .SH FILES
 .TP