Jasmine 1.3.x custom matchers, both global and scoped to a specific describe suite

MySpec.js

"use strict";

describe("Jasmine", function () {

    describe("custom matchers", function () {
    
        beforeEach(function () {
            this.addMatchers({
                toBeSomethingBeforeEachInSpec: function (expected) {
                    return this.actual.something === "something";
                }
            });
        });
    
        it("should work with custom matchers in this spec", function () {
            var myObject = {something: "something"};
            expect(myObject).toBeSomethingBeforeEachInSpec('param, in spec');
        });

        it("should work with global custom matchers", function () {
            var myObject = {something: "something"};
            expect(myObject).toBeSomethingBeforeEachGlobal('param, in global');
        });
    });
});

SpecHelper.js

"use strict";

beforeEach(function () {
    this.addMatchers({
        toBeSomethingBeforeEachGlobal: function (expected) {
            return this.actual.something === "something";
        }
    });
});