diff --git a/source/Mockingboard.cpp b/source/Mockingboard.cpp
index 86aa6879..390a6821 100644
--- a/source/Mockingboard.cpp
+++ b/source/Mockingboard.cpp
@@ -287,7 +287,7 @@ void MockingboardCard::UpdateIFRandIRQ(MB_SUBUNIT* pMB, BYTE clr_mask, BYTE set_
 
 //---------------------------------------------------------------------------
 
-// Called from class SY6522
+// Called from MockingboardCardMgr
 bool MockingboardCard::Is6522IRQ(void)
 {
 	// Now update the IRQ signal from all 6522s
diff --git a/source/MockingboardCardManager.cpp b/source/MockingboardCardManager.cpp
index c08bfded..e3eeff5a 100644
--- a/source/MockingboardCardManager.cpp
+++ b/source/MockingboardCardManager.cpp
@@ -109,6 +109,7 @@ void MockingboardCardManager::UpdateCycles(ULONG executedCycles)
 	}
 }
 
+// Called from class SY6522
 void MockingboardCardManager::UpdateIRQ(void)
 {
 	bool irq = false;