diff --git a/man/tio.1.in b/man/tio.1.in
index 3757f1b..78cb511 100644
--- a/man/tio.1.in
+++ b/man/tio.1.in
@@ -352,7 +352,9 @@ Toggle conversion to uppercase on output
 .IP "\fBctrl-t v"
 Show version
 .IP "\fBctrl-t x"
-Send a file using the XMODEM protocol (prompts for file name)
+Send a file using the XMODEM-1K protocol (prompts for file name)
+.IP "\fBctrl-t X"
+Send a file using the XMODEM-CRC protocol (prompts for file name)
 .IP "\fBctrl-t y"
 Send a file using the YMODEM protocol (prompts for file name)
 .IP "\fBctrl-t ctrl-t"
diff --git a/man/tio.1.txt b/man/tio.1.txt
index 3c1daa7..d85deaa 100644
--- a/man/tio.1.txt
+++ b/man/tio.1.txt
@@ -257,7 +257,9 @@ KEYS
 
        ctrl-t v        Show version
 
-       ctrl-t x        Send a file using the XMODEM protocol (prompts for file name)
+       ctrl-t x        Send a file using the XMODEM-1K protocol (prompts for file name)
+
+       ctrl-t X        Send a file using the XMODEM-CRC protocol (prompts for file name)
 
        ctrl-t y        Send a file using the YMODEM protocol (prompts for file name)