diff --git a/src/serial.cpp b/src/serial.cpp
index ce9df82..f1fef88 100644
--- a/src/serial.cpp
+++ b/src/serial.cpp
@@ -28,6 +28,9 @@ void serial_loop() {
       case 'a':
         setMode((ModeId) (input - 'a' + 10));
         break;
+      case 'r':
+        setSpeed(1.0);
+        break;
       case '+':
         setBrightness(display.getBrightness() + 10);
         break;