diff --git a/src/common/StellaKeys.hxx b/src/common/StellaKeys.hxx
index 0b0bb79e5..72a95ab96 100644
--- a/src/common/StellaKeys.hxx
+++ b/src/common/StellaKeys.hxx
@@ -330,10 +330,10 @@ enum StellaKey
     KBDK_RALT = 230, /**< alt gr, option */
     KBDK_RGUI = 231, /**< windows, command (apple), meta */
 
-    KBDK_MODE = 257,    /**< I'm not sure if this is really not covered
-                                 *   by any of the above, but since there's a
-                                 *   special KMOD_MODE for it I'm adding it here
-                                 */
+    KBDK_MODE = 257,    /**< ALT-GR(aph) key on non-American keyboards
+                         *   This is like pressing KBDK_RALT + KBDK_RCTRL
+                         *   on some keyboards
+                         */
 
     /* @} *//* Usage page 0x07 */
 
diff --git a/src/gui/HelpDialog.cxx b/src/gui/HelpDialog.cxx
index b5f8970c8..a18e663c6 100644
--- a/src/gui/HelpDialog.cxx
+++ b/src/gui/HelpDialog.cxx
@@ -93,7 +93,8 @@ void HelpDialog::updateStrings(uInt8 page, uInt8 lines, string& title)
   };
   auto ADD_EVENT = [&](const Event::Type e, const string & d)
   {
-    ADD_BIND(instance().eventHandler().getMappingDesc(e, kEmulationMode), d);
+    string desc = instance().eventHandler().getMappingDesc(e, kEmulationMode);
+    ADD_BIND(desc.length() ? desc : "None", d);
   };
   auto ADD_TEXT = [&](const string& d) { ADD_BIND("", d); };
   auto ADD_LINE = [&]() { ADD_BIND("", ""); };