diff --git a/src/context2d.cc b/src/context2d.cc
index e2a2704..2b2efb3 100644
--- a/src/context2d.cc
+++ b/src/context2d.cc
@@ -100,6 +100,7 @@ Context2d::Initialize(Handle<Object> target) {
   NODE_SET_PROTOTYPE_METHOD(t, "arc", Arc);
   NODE_SET_PROTOTYPE_METHOD(t, "setFillRGBA", SetFillRGBA);
   NODE_SET_PROTOTYPE_METHOD(t, "setStrokeRGBA", SetStrokeRGBA);
+  proto->SetAccessor(String::NewSymbol("globalCompositeOperation"), GetGlobalCompositeOperation, SetGlobalCompositeOperation);
   proto->SetAccessor(String::NewSymbol("globalAlpha"), GetGlobalAlpha, SetGlobalAlpha);
   proto->SetAccessor(String::NewSymbol("miterLimit"), GetMiterLimit, SetMiterLimit);
   proto->SetAccessor(String::NewSymbol("lineWidth"), GetLineWidth, SetLineWidth);
@@ -162,6 +163,26 @@ Context2d::SetGlobalAlpha(Local<String> prop, Local<Value> val, const AccessorIn
   context->globalAlpha = val->NumberValue();
 }
 
+/*
+ * Get global composite operation.
+ */
+
+Handle<Value>
+Context2d::GetGlobalCompositeOperation(Local<String> prop, const AccessorInfo &info) {
+  Context2d *context = ObjectWrap::Unwrap<Context2d>(info.This());
+  return Number::New(context->globalAlpha);
+}
+
+/*
+ * Set global composite operation.
+ */
+
+void
+Context2d::SetGlobalCompositeOperation(Local<String> prop, Local<Value> val, const AccessorInfo &info) {
+  Context2d *context = ObjectWrap::Unwrap<Context2d>(info.This());
+  context->globalAlpha = val->NumberValue();
+}
+
 /*
  * Get miter limit.
  */
diff --git a/src/context2d.h b/src/context2d.h
index b9c3695..e5fc5f9 100644
--- a/src/context2d.h
+++ b/src/context2d.h
@@ -41,11 +41,13 @@ class Context2d: public node::ObjectWrap {
     static Handle<Value> ClearRect(const Arguments &args);
     static Handle<Value> Rect(const Arguments &args);
     static Handle<Value> Arc(const Arguments &args);
+    static Handle<Value> GetGlobalCompositeOperation(Local<String> prop, const AccessorInfo &info);
     static Handle<Value> GetGlobalAlpha(Local<String> prop, const AccessorInfo &info);
     static Handle<Value> GetMiterLimit(Local<String> prop, const AccessorInfo &info);
     static Handle<Value> GetLineCap(Local<String> prop, const AccessorInfo &info);
     static Handle<Value> GetLineJoin(Local<String> prop, const AccessorInfo &info);
     static Handle<Value> GetLineWidth(Local<String> prop, const AccessorInfo &info);
+    static void SetGlobalCompositeOperation(Local<String> prop, Local<Value> val, const AccessorInfo &info);
     static void SetGlobalAlpha(Local<String> prop, Local<Value> val, const AccessorInfo &info);
     static void SetMiterLimit(Local<String> prop, Local<Value> val, const AccessorInfo &info);
     static void SetLineCap(Local<String> prop, Local<Value> val, const AccessorInfo &info);