diff --git a/dm.h b/dm.h
new file mode 100644
index 0000000..2491c63
--- /dev/null
+++ b/dm.h
@@ -0,0 +1,38 @@
+/**
+ * @file dm.h
+ * @brief Enumerates the delay mechanisms.
+ * @note Copyright (C) 2012 Richard Cochran <richardcochran@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#ifndef HAVE_DM_H
+#define HAVE_DM_H
+
+/**
+ * Defines the possible delay mechanisms.
+ */
+enum delay_mechanism {
+
+	/** Start as E2E, but switch to P2P if a peer is detected. */
+	DM_AUTO,
+
+	/** Delay request-response mechanism. */
+	DM_E2E,
+
+	/** Peer delay mechanism. */
+	DM_P2P,
+};
+
+#endif
diff --git a/port.h b/port.h
index 6e8da71..6f02b73 100644
--- a/port.h
+++ b/port.h
@@ -19,18 +19,12 @@
 #ifndef HAVE_PORT_H
 #define HAVE_PORT_H
 
+#include "dm.h"
 #include "fd.h"
 #include "foreign.h"
 #include "fsm.h"
 #include "transport.h"
 
-/** Defines the possible delay mechanisms. */
-enum delay_mechanism {
-	DM_AUTO, /**< Just go with the flow  */
-	DM_E2E,  /**< End to End mechanism   */
-	DM_P2P,  /**< Peer to Peer mechanism */
-};
-
 /** Opaque type. */
 struct port;