diff --git a/help/cfg-advanced.html b/help/cfg-advanced.html
index f738b0c7..4c2891b9 100644
--- a/help/cfg-advanced.html
+++ b/help/cfg-advanced.html
@@ -88,10 +88,11 @@ Supported devices are:
 	<li> Southwestern Data Systems' datakey - SpeedStar (copy protection dongle)
 	<li> Dynatech Microsoftware / Cortechs Corp's protection key - CodeWriter (copy protection dongle)
 	<li> Robocom Ltd's interface module - Robo 500/1000/1500 & RoboCAD 1/2 (copy protection dongle)
+	<li> Hayden Book Company, Inc's protection key - Applesoft Compiler (copy protection dongle)
 </ul>
 NB. Copy protection dongles can interfere with joysticks (eg. buttons may be hardwired to a fixed state), so only use dongles with the intended software.<br>
 NB. Copy protection dongles can interfere with RGB cards (eg. unexpected video modes may get selected).<br>
-NB. For Apple II/II+ models, when a joystick is selected (from the <a href="cfg-input.html">Input</a> tab), then there is also an implicit joystick connected at the same time as the device selected here.
+NB. For Apple II/II+ models, when a joystick is selected (from the <a href="cfg-input.html">Input</a> tab), then there is also an implicit joystick connected at the same time as the device selected here (and some dongles even allowed 16-pin game connectors to be plugged in on top, eg. SDS and Robocom devices).
 </p>
 
 </body></html>
diff --git a/source/Configuration/PageAdvanced.cpp b/source/Configuration/PageAdvanced.cpp
index 64f6c4b6..5a0c3372 100644
--- a/source/Configuration/PageAdvanced.cpp
+++ b/source/Configuration/PageAdvanced.cpp
@@ -51,7 +51,7 @@ const TCHAR CPageAdvanced::m_gameIOConnectorChoices[] =
 				"Robocom Ltd - Robo 500\0"		/* Interface Module for Robocom Ltd's Robo 500 */
 				"Robocom Ltd - Robo 1000\0"		/* Interface Module for Robocom Ltd's Robo 1000 */
 				"Robocom Ltd - Robo 1500, CAD-2P\0"	/* Interface Module for Robocom Ltd's Robo 1500, Robo Systems CAD-2P */
-				"Hayden - Applesoft Compiler\0";	/* Protection key for Hayden's Applsoft Compiler (1981) */
+				"Hayden - Applesoft Compiler\0";	/* Protection key for Hayden Book Company, Inc's Applesoft Compiler (1981) */
 
 
 INT_PTR CALLBACK CPageAdvanced::DlgProc(HWND hWnd, UINT message, WPARAM wparam, LPARAM lparam)
diff --git a/source/CopyProtectionDongles.cpp b/source/CopyProtectionDongles.cpp
index 91741aff..84b8f8bd 100644
--- a/source/CopyProtectionDongles.cpp
+++ b/source/CopyProtectionDongles.cpp
@@ -29,7 +29,7 @@
 	- Southwestern Data Systems' datakey for SpeedStar Applesoft Compiler (Matthew D'Asaro  Dec 2022)
 	- Dynatech Microsoftware / Cortechs Corp's protection key for "CodeWriter"
 	- Robocom Ltd's Interface Module for Robo Graphics 500/1000/1500 & RoboCAD 1/2 (BitStik joystick plugs in on top)
-	- Hayden's protection key for "Applesoft Compiler"
+	- Hayden Book Company, Inc's protection key for "Applesoft Compiler"
 */
 #include "StdAfx.h"
 #include <sstream>