diff --git a/man/tio.1.in b/man/tio.1.in
index 3f29c6b..1ec1355 100644
--- a/man/tio.1.in
+++ b/man/tio.1.in
@@ -292,7 +292,7 @@ Toggle local echo mode
 .IP "\fBctrl-t f"
 Toggle log to file
 .IP "\fBctrl-t F"
-Flush data I/O channels (discard data written but not transmitted and data received but not read)
+Flush data I/O buffers (discard data written but not transmitted and data received but not read)
 .IP "\fBctrl-t g"
 Toggle serial port line
 .IP "\fBctrl-t h"
diff --git a/src/tty.c b/src/tty.c
index 83116b9..faad20c 100644
--- a/src/tty.c
+++ b/src/tty.c
@@ -525,6 +525,7 @@ void handle_command_sequence(char input_char, char *output_char, bool *forward)
                 tio_printf(" ctrl-%c c       Show configuration", option.prefix_key);
                 tio_printf(" ctrl-%c e       Toggle local echo mode", option.prefix_key);
                 tio_printf(" ctrl-%c f       Toggle log to file", option.prefix_key);
+                tio_printf(" ctrl-%c F       Flush data I/O buffers", option.prefix_key);
                 tio_printf(" ctrl-%c g       Toggle serial port line", option.prefix_key);
                 tio_printf(" ctrl-%c h       Toggle hexadecimal mode", option.prefix_key);
                 tio_printf(" ctrl-%c l       Clear screen", option.prefix_key);