diff --git a/src/MDMMotionAnimator.h b/src/MDMMotionAnimator.h
index 89d51f9..cf08b97 100644
--- a/src/MDMMotionAnimator.h
+++ b/src/MDMMotionAnimator.h
@@ -66,6 +66,10 @@ NS_SWIFT_NAME(MotionAnimator)
 /**
  Adds a single animation to the layer with the given timing structure.
 
+ If `additive` is disabled, the animation will be added to the layer with the keyPath as its key.
+ In this case, multiple invocations of this function on the same key path will remove the
+ animations added from prior invocations.
+
  @param timing The timing to be used for the animation.
  @param layer The layer to be animated.
  @param values The values to be used in the animation. Must contain exactly two values. Supported
@@ -81,6 +85,10 @@ NS_SWIFT_NAME(MotionAnimator)
 /**
  Adds a single animation to the layer with the given timing structure.
 
+ If `additive` is disabled, the animation will be added to the layer with the keyPath as its key.
+ In this case, multiple invocations of this function on the same key path will remove the
+ animations added from prior invocations.
+
  @param timing The timing to be used for the animation.
  @param layer The layer to be animated.
  @param values The values to be used in the animation. Must contain exactly two values. Supported
diff --git a/src/MDMMotionAnimator.m b/src/MDMMotionAnimator.m
index ec5c150..fa30c3b 100644
--- a/src/MDMMotionAnimator.m
+++ b/src/MDMMotionAnimator.m
@@ -100,7 +100,8 @@ - (void)animateWithTiming:(MDMMotionTiming)timing
 
       // When we use a nil key, Core Animation will ensure that the animation is added with a
       // unique key - this enables our additive animations to stack upon one another.
-      [layer addAnimation:animation forKey:nil];
+      NSString *key = _additive ? nil : keyPath;
+      [layer addAnimation:animation forKey:key];
 
       for (void (^tracer)(CALayer *, CAAnimation *) in _tracers) {
         tracer(layer, animation);
diff --git a/tests/unit/MotionAnimatorTests.swift b/tests/unit/MotionAnimatorTests.swift
index 86199c0..404aa59 100644
--- a/tests/unit/MotionAnimatorTests.swift
+++ b/tests/unit/MotionAnimatorTests.swift
@@ -47,8 +47,10 @@ class MotionAnimatorTests: XCTestCase {
     XCTAssertTrue(true)
   }
 
-  func testAnimatorOnlyAddsAnimationsForKeyPath() {
+  func testAnimatorOnlyUsesSingleNonAdditiveAnimationForKeyPath() {
     let animator = MotionAnimator()
+    animator.additive = false
+
     let timing = MotionTiming(delay: 0,
                               duration: 1,
                               curve: .init(type: .bezier, data: (0, 0, 0, 0)),
@@ -64,9 +66,7 @@ class MotionAnimatorTests: XCTestCase {
     UIView.animate(withDuration: 0.5) {
       animator.animate(with: timing, to: view.layer, withValues: [0, 1], keyPath: .rotation)
 
-      // Setting transform.rotation.z will create an implicit transform if implicit animations
-      // aren't disabled by the animator properly, so verify that such an animation doesn't exist:
-      XCTAssertNil(view.layer.animation(forKey: "transform"))
+      XCTAssertEqual(view.layer.animationKeys()?.count, 1)
     }
   }
 }