diff --git a/source/server/data-type.h b/source/server/data-type.h
new file mode 100644
index 0000000..24502cc
--- /dev/null
+++ b/source/server/data-type.h
@@ -0,0 +1,32 @@
+// =========================================
+// | SilverMUD Server - data-type.h        |
+// | Copyright (C) 2023, Barra Ó Catháin   |
+// | See end of file for copyright notice. |
+// =========================================
+#ifndef DATATYPE_H
+#define DATATYPE_H
+
+enum DataType
+{
+	AREA,
+	PLAYER,
+	CONNECTION
+};
+
+#endif
+// =================================================
+// | End of data-type.h, copyright notice follows. |
+// =================================================
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
diff --git a/source/server/lists.h b/source/server/lists.h
index 53c978e..e426ad3 100644
--- a/source/server/lists.h
+++ b/source/server/lists.h
@@ -5,15 +5,9 @@
 // =========================================
 #ifndef LISTS_H
 #define LISTS_H
+#include "data-type.h"
 #include <stdbool.h>
 
-enum DataType
-{
-	AREA,
-	PLAYER,
-	CONNECTION
-};
-
 struct List
 {
 	size_t itemCount;
@@ -58,4 +52,3 @@ bool isPointerInList(void * data, struct List * list);
 
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
-