diff --git a/routines/routines.go b/routines/routines.go
index 0d0dfd6..4203263 100644
--- a/routines/routines.go
+++ b/routines/routines.go
@@ -6,12 +6,9 @@ import "log"
 import "time"
 import "sync"
 
-// Routine represents an object that can be run.
-type Routine interface {
-	// Run starts the routine and does not return until it is finished. An
-	// error is returned if the routine exited due to an error.
-	Run () error
-}
+// Routine is a long-running function that does not return until it is finished.
+// An error is returned if the routine exited due to an error.
+type Routine func () error
 
 // Manager is a system capable of managing multiple routines, and restarting
 // them if they fail.
@@ -49,6 +46,12 @@ func (manager *Manager) Run () error {
 	return errExit
 }
 
+// Append adds one or more routines to the Routines slice. This has no effect if
+// the manager is already running.
+func (manager *Manager) Append (routines ...Routine) {
+	manager.Routines = append(manager.Routines, routines...)
+}
+
 func (manager *Manager) log (message ...any) {
 	if manager.Logger == nil {
 		log.Println(message...)
@@ -64,7 +67,7 @@ func (manager *Manager) runRoutine (routine Routine, group *sync.WaitGroup, errE
 	for {
 		// TODO: recover from panics
 		lastStart := time.Now()
-		err = routine.Run()
+		err = routine()
 
 		if err == nil {
 			manager.log("(i) routine exited")