diff --git a/OSBindings/Mac/Clock SignalTests/OPLTests.mm b/OSBindings/Mac/Clock SignalTests/OPLTests.mm
index 1948e47d9..54ac1acbd 100644
--- a/OSBindings/Mac/Clock SignalTests/OPLTests.mm	
+++ b/OSBindings/Mac/Clock SignalTests/OPLTests.mm	
@@ -17,6 +17,8 @@
 @implementation OPLTests {
 }
 
+// MARK: - Table tests
+
 - (void)testSineLookup {
 	for(int c = 0; c < 1024; ++c) {
 		const auto logSin = Yamaha::OPL::negative_log_sin(c);
@@ -29,6 +31,8 @@
 	}
 }
 
+// MARK: - Two-operator FM tests
+
 - (void)compareFMTo:(NSArray *)knownGood atAttenuation:(int)attenuation {
 	Yamaha::OPL::Operator modulator, carrier;
 	Yamaha::OPL::Channel channel;
@@ -83,6 +87,7 @@
 	}
 }
 
+// MARK: - ADSR tests
 
 - (void)testADSR {
 	Yamaha::OPL::Operator test_operator;