diff --git a/src/mame/drivers/arachnid.c b/src/mame/drivers/arachnid.c
index 24cb48cbb50..0d8867f27da 100644
--- a/src/mame/drivers/arachnid.c
+++ b/src/mame/drivers/arachnid.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Jim Stolis
 /*
     Arachnid - English Mark Darts
diff --git a/src/mame/drivers/drw80pkr.c b/src/mame/drivers/drw80pkr.c
index 975557e39d5..dd4fc381947 100644
--- a/src/mame/drivers/drw80pkr.c
+++ b/src/mame/drivers/drw80pkr.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Jim Stolis
 /**********************************************************************************
 
diff --git a/src/mame/drivers/peplus.c b/src/mame/drivers/peplus.c
index 2891305c61d..3cd060ccc55 100644
--- a/src/mame/drivers/peplus.c
+++ b/src/mame/drivers/peplus.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Jim Stolis, Brian Troha
 /**********************************************************************************
 
diff --git a/src/mame/drivers/splus.c b/src/mame/drivers/splus.c
index 25371de1431..a0562991942 100644
--- a/src/mame/drivers/splus.c
+++ b/src/mame/drivers/splus.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Jim Stolis
 /**********************************************************************************