diff --git a/tty-clock.1 b/tty-clock.1
index 2b98ff5..9c023c1 100644
--- a/tty-clock.1
+++ b/tty-clock.1
@@ -61,6 +61,12 @@ Pause and resume clock, timer or countdown.
 Z
 Restart the timer or countdown (see \fB-p\fR below). This command has no effect on regular time display.
 .TP
++
+Add one minute to the timer/countdown.
+.TP
+-
+Subtract one minute to the timer/countdown.
+.TP
 Q
 Quit.
 .SH "OPTIONS"
diff --git a/ttyclock.c b/ttyclock.c
index 9712087..a692a0c 100644
--- a/ttyclock.c
+++ b/ttyclock.c
@@ -1,6 +1,6 @@
 /*
  *      TTY-CLOCK Main file.
- *      Copyright © 2009-2018 tty-clock contributors
+ *      Copyright © 2009-2021 tty-clock contributors
  *      Copyright © 2008 Martin Duquesnoy <xorg62@gmail.com>
  *      All rights reserved.
  *
@@ -631,6 +631,16 @@ key_event(void)
                ttyclock.lt_paused = ttyclock.lt;
           break;
 
+     case '+':
+          if(ttyclock.lt_origin)
+               ttyclock.lt_origin += 60;
+          break;
+
+     case '-':
+          if(ttyclock.lt_origin)
+               ttyclock.lt_origin -= 60;
+          break;
+
      case ' ':
           if(!ttyclock.lt_paused)
                ttyclock.lt_paused = ttyclock.lt;