       var pitch: Pitch!
 
       describe("#init") {
-        context("pitch notations") {
+        context("with frequency") {
 
           it("creates C4") {
             pitch = Pitch(frequency: 261.626)

            expect(pitch).toNot(beNil())
            expect(pitch.note).to(equal(Note.B))
            expect(pitch.octave).to(equal(4))
            expect(pitch.frequency).to(equal(493.883))
          }
        }
      }

            expect(pitch).toNot(beNil())
            expect(pitch.note).to(equal(Note.CSharp))
            expect(pitch.octave).to(equal(6))
            expect(pitch.frequency) ≈ (1108.73, 0.01)
          }

          it("creates D5") {
