-\preamble PuTTY is a free (MIT-licensed) Win32 Telnet and SSH
-client. This manual documents PuTTY, and its companion utilities
-PSCP, Plink, Pageant and PuTTYgen.
+PuTTY is a free (MIT-licensed) Win32 Telnet and SSH client. This
+manual documents PuTTY, and its companion utilities PSCP, PSFTP,
+Plink, Pageant and PuTTYgen.
+
+\e{Note to Unix users:} this manual currently primarily documents the
+Windows versions of the PuTTY utilities. Some options are therefore
+mentioned that are absent from the Unix version; the Unix version has
+features not described here; and the \cw{pterm} and command-line
+\cw{puttygen} utilities are not described at all. The only
+Unix-specific documentation that currently exists is the man pages.