More correctly and completely describe what -Z does now.

diff --git a/tcpdump.1.in b/tcpdump.1.in
index cdbb941bef1c080c650fc54593ccb90e15f2a482..9418ad9d9ab14acd80b98f7ee7c69db7b9d27f6c 100644 (file)
--- a/tcpdump.1.in
+++ b/tcpdump.1.in
@@ -634,7 +634,10 @@ savefile name as the only argument, make the flags & arguments arrangements
 and execute the command that you want.
 .TP
 .B \-Z
-Drops privileges (if root) and changes user ID to
+If
+.I tcpdump
+is running as root, after opening the capture device or input savefile,
+but before opening any savefiles for output, change the user ID to
 .I user
 and the group ID to the primary group of
 .IR user .