diff --git a/src/physics/arcade/World.js b/src/physics/arcade/World.js
index 7ff8fb47a..d23479f75 100644
--- a/src/physics/arcade/World.js
+++ b/src/physics/arcade/World.js
@@ -983,7 +983,7 @@ var World = new Class({
                 }
             }
 
-            this.emit(Events.WORLD_STEP);
+            this.emit(Events.WORLD_STEP, fixedDelta);
         }
 
         //  Process any additional steps this frame
@@ -1042,7 +1042,7 @@ var World = new Class({
             }
         }
 
-        this.emit(Events.WORLD_STEP);
+        this.emit(Events.WORLD_STEP, delta);
 
         this.stepsLastFrame++;
     },
diff --git a/src/physics/arcade/events/WORLD_STEP_EVENT.js b/src/physics/arcade/events/WORLD_STEP_EVENT.js
index dc404d7a6..f815e8235 100644
--- a/src/physics/arcade/events/WORLD_STEP_EVENT.js
+++ b/src/physics/arcade/events/WORLD_STEP_EVENT.js
@@ -6,15 +6,17 @@
 
 /**
  * The Arcade Physics World Step Event.
- * 
+ *
  * This event is dispatched by an Arcade Physics World instance whenever a physics step is run.
  * It is emitted _after_ the bodies and colliders have been updated.
- * 
+ *
  * In high framerate settings this can be multiple times per game frame.
- * 
+ *
  * Listen to it from a Scene using: `this.physics.world.on('worldstep', listener)`.
  *
  * @event Phaser.Physics.Arcade.Events#WORLD_STEP
  * @since 3.18.0
+ *
+ * @param {number} delta - The delta time amount of this step, in seconds.
  */
 module.exports = 'worldstep';