diff --git a/doc/config.but b/doc/config.but
index bb18b794..bd12efb2 100644
--- a/doc/config.but
+++ b/doc/config.but
@@ -499,8 +499,8 @@ instead of relying on the automatic detection.
 \cfg{winhelp-topic}{terminal.printing}
 
 A lot of VT100-compatible terminals support printing under control
-of the remote server. PuTTY supports this feature as well, but it is
-turned off by default.
+of the remote server (sometimes called \q{passthrough printing}).
+PuTTY supports this feature as well, but it is turned off by default.
 
 To enable remote-controlled printing, choose a printer from the
 \q{Printer to send ANSI printer output to} drop-down list box. This
diff --git a/doc/index.but b/doc/index.but
index 30ebd784..0877ee90 100644
--- a/doc/index.but
+++ b/doc/index.but
@@ -340,6 +340,7 @@ saved sessions from
 \IM{remote-controlled printing} ANSI printing
 \IM{remote-controlled printing} remote-controlled printing
 \IM{remote-controlled printing} printing, remote-controlled
+\IM{remote-controlled printing} passthrough printing
 
 \IM{Home and End keys} Home key
 \IM{Home and End keys} End key