diff --git a/devices/memctrl/aspen.h b/devices/memctrl/aspen.h
index 55fb7ed..ef1a63b 100644
--- a/devices/memctrl/aspen.h
+++ b/devices/memctrl/aspen.h
@@ -23,6 +23,8 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
     Aspen is a custom memory controller and PCI bridge
     designed especially for Pippin.
+
+    Kudos to Keith Kaisershot @ blitter.net for his precious technical help!
 */
 
 #ifndef ASPEN_MEMCTRL_H
diff --git a/machines/machinepippin.cpp b/machines/machinepippin.cpp
index 25ed92b..68a24f2 100644
--- a/machines/machinepippin.cpp
+++ b/machines/machinepippin.cpp
@@ -21,6 +21,10 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 /** @file Bandai/Atmark Pippin emulation. */
 
+/**
+    Kudos to Keith Kaisershot @ blitter.net for his precious technical help!
+*/
+
 #include <cpu/ppc/ppcemu.h>
 #include <devices/common/pci/pcihost.h>
 #include <devices/ioctrl/macio.h>