diff --git a/README.md b/README.md
index 7aa1cdc..d839ca7 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ options = {
     onWorldState(callback(state)),
     onPing(callback(pingDelay)),
     onUpdatePlayerPhysics(callback(state, inputs, deltaTime)),
-    onInterpolation(callback(previousState, targetState, amount)),
+    onInterpolation(callback(previousState, targetState, amount)) : newState,
     onReady(callback),
     logging: true
 }
diff --git a/client/garageserver.io.js b/client/garageserver.io.js
index e0c55aa..8a9d6b5 100644
--- a/client/garageserver.io.js
+++ b/client/garageserver.io.js
@@ -11,7 +11,7 @@ options = {
     onWorldState(callback(state)),
     onPing(callback(pingDelay)),
     onUpdatePlayerPhysics(callback(state, inputs, deltaTime)),
-    onInterpolation(callback(previousState, targetState, amount)),
+    onInterpolation(callback(previousState, targetState, amount)) : newState,
     onReady(callback),
     logging: true
 }