diff --git a/packages/entity/traits/spawner.trait.js b/packages/entity/traits/spawner.trait.js
index c3e65bd..47e5a77 100644
--- a/packages/entity/traits/spawner.trait.js
+++ b/packages/entity/traits/spawner.trait.js
@@ -14,6 +14,8 @@ const decorate = compose(
 export default class Spawner extends decorate(Trait) {
 
   static behaviorTypes() {
+    const spawnKeys = (entity) => Object.keys(entity.traitInstance('spawner').params.spawns)
+      .reduce((r, key) => ({...r, [key]: key}), {})
     return {
       killAllChildren: {
         type: 'void',
@@ -26,6 +28,7 @@ export default class Spawner extends decorate(Trait) {
         args: [
           ['key', {
             type: 'string',
+            options: spawnKeys,
           }],
           ['json', {
             type: 'object',
@@ -39,6 +42,7 @@ export default class Spawner extends decorate(Trait) {
         args: [
           ['key', {
             type: 'string',
+            options: spawnKeys,
           }],
           ['position', {
             type: 'vector',