diff --git a/docs/how-to-create-new-effects.md b/docs/how-to-create-new-effects.md
index 9b1ccc1..3296cfe 100644
--- a/docs/how-to-create-new-effects.md
+++ b/docs/how-to-create-new-effects.md
@@ -144,7 +144,7 @@ var SimpleFade = class SimpleFade {
   // ---------------------------------------------------------------- API for extension.js
 
   // This is called from extension.js whenever a window is closed with this effect.
-  static createShader(settings) {
+  static createShader(actor, settings) {
     return new Shader(settings);
   }
 
diff --git a/extension.js b/extension.js
index c9569ed..74909df 100644
--- a/extension.js
+++ b/extension.js
@@ -181,7 +181,7 @@ class Extension {
       Effect.tweakTransitions(actor, this._settings);
 
       // Add a cool shader to our window actor!
-      const shader = Effect.createShader(this._settings);
+      const shader = Effect.createShader(actor, this._settings);
 
       if (shader) {
         actor.add_effect(shader);
diff --git a/src/EnergizeA.js b/src/EnergizeA.js
index 2d16b12..b20be00 100644
--- a/src/EnergizeA.js
+++ b/src/EnergizeA.js
@@ -76,7 +76,7 @@ var EnergizeA = class EnergizeA {
   // ---------------------------------------------------------------- API for extension.js
 
   // This is called from extension.js whenever a window is closed with this effect.
-  static createShader(settings) {
+  static createShader(actor, settings) {
     return new Shader(settings);
   }
 
diff --git a/src/EnergizeB.js b/src/EnergizeB.js
index 58e225b..0bf87d8 100644
--- a/src/EnergizeB.js
+++ b/src/EnergizeB.js
@@ -76,7 +76,7 @@ var EnergizeB = class EnergizeB {
   // ---------------------------------------------------------------- API for extension.js
 
   // This is called from extension.js whenever a window is closed with this effect.
-  static createShader(settings) {
+  static createShader(actor, settings) {
     return new Shader(settings);
   }
 
diff --git a/src/Fire.js b/src/Fire.js
index b90c078..5060b5e 100644
--- a/src/Fire.js
+++ b/src/Fire.js
@@ -97,7 +97,7 @@ var Fire = class Fire {
   // ---------------------------------------------------------------- API for extension.js
 
   // This is called from extension.js whenever a window is closed with this effect.
-  static createShader(settings) {
+  static createShader(actor, settings) {
     return new Shader(settings);
   }
 
diff --git a/src/Matrix.js b/src/Matrix.js
index 3701f99..8d8ab66 100644
--- a/src/Matrix.js
+++ b/src/Matrix.js
@@ -82,7 +82,7 @@ var Matrix = class Matrix {
   // ---------------------------------------------------------------- API for extension.js
 
   // This is called from extension.js whenever a window is closed with this effect.
-  static createShader(settings) {
+  static createShader(actor, settings) {
     return new Shader(settings);
   }
 
diff --git a/src/TRexAttack.js b/src/TRexAttack.js
index 3b610a4..2c57293 100644
--- a/src/TRexAttack.js
+++ b/src/TRexAttack.js
@@ -80,7 +80,7 @@ var TRexAttack = class TRexAttack {
   // ---------------------------------------------------------------- API for extension.js
 
   // This is called from extension.js whenever a window is closed with this effect.
-  static createShader(settings) {
+  static createShader(actor, settings) {
     return new Shader(settings);
   }
 
diff --git a/src/TVEffect.js b/src/TVEffect.js
index 96643b6..0d37efc 100644
--- a/src/TVEffect.js
+++ b/src/TVEffect.js
@@ -77,7 +77,7 @@ var TVEffect = class TVEffect {
   // ---------------------------------------------------------------- API for extension.js
 
   // This is called from extension.js whenever a window is closed with this effect.
-  static createShader(settings) {
+  static createShader(actor, settings) {
     return new Shader(settings);
   }
 
diff --git a/src/Wisps.js b/src/Wisps.js
index e221cad..e73b29a 100644
--- a/src/Wisps.js
+++ b/src/Wisps.js
@@ -76,7 +76,7 @@ var Wisps = class Wisps {
   // ---------------------------------------------------------------- API for extension.js
 
   // This is called from extension.js whenever a window is closed with this effect.
-  static createShader(settings) {
+  static createShader(actor, settings) {
     return new Shader(settings);
   }