diff --git a/src/mame/drivers/ladybug.c b/src/mame/drivers/ladybug.c
index 7f5500cabe4..9dba6055884 100644
--- a/src/mame/drivers/ladybug.c
+++ b/src/mame/drivers/ladybug.c
@@ -1,9 +1,20 @@
 /***************************************************************************
 
-Lady Bug memory map (preliminary)
+Universal 8106-A2 + 8106-B PCB set
 
 driver by Nicola Salmoria
 
+  Confirmed to use the 8106-A2/8106-B PCB:
+    Lady Bug
+    Snap Jack
+    Cosmic Avenger
+
+  Simular or bootleg PCB:
+    Dorodon (by Falcon)
+    Space Raider
+
+Memory map (preliminary)
+
 0000-5fff ROM
 6000-6fff RAM
 d000-d3ff video RAM