1 files changed, 1 insertions, 0 deletions
diff --git a/src/Robot.java b/src/Robot.java
index b0bca1a..d050b6f 100644
--- a/src/Robot.java
+++ b/src/Robot.java
@@ -482,6 +482,7 @@ class Robot extends BetterBase {
      * Set the speed (meters per second) for this robot.
      */
     public void setSpeed(double speed) {
+        assert speed >= 0 : "Speed must be positive!";
         this.speed = speed;
     }