diff --git a/flash/README b/flash/README
index be06602d09902800de499f7dbc83fbe3dd1cc0ca..c5efcbf378e5d961f8851c11f92c996efc70b075 100644
--- a/flash/README
+++ b/flash/README
@@ -52,6 +52,10 @@ directory (installed as /FOO/etc/rc.d/cdroot) to use "cp -rp" instead.
 Create /FOO/usr/local/lib and copy in libintl.so.2, which is needed
 by wget, unless you go and reconfig it to statically link.
 
+In addition to wget, there are a few other ports that need to be installed.
+perl5, sudo and the dhcpd-client port (the last is used in place of the
+pre-installed BSD version of dhclient).
+
 We use a special, modified version of the FreeBSD second-level boot loader
 (loader) which supports a local 'testbed_boot' command.  This can be
 found in users.emulab.net:/share/freebsd/6.2/src/sys/boot/i386/emuboot-cd.
@@ -103,6 +107,10 @@ with 32K or 64K.  You may want to play around with lowering the number of
 inodes (-i) in newfs as well; there are only about 8000 files in our
 current FS.
 
+[ WARNING: on at least one PQI flash drive, when I tried to create the dd
+  image with blocksize of 16k or 8k, it read bogus data (bytes of -1 which
+  should have been 0s).  When read with a block size of 4k or smaller it
+  worked.  This is distressing since the filesystem will read 16k blocks. ]
 
 *** Test the dongle