diff --git a/notifier.go b/notifier.go
index 4e30a9b..46c0dd5 100644
--- a/notifier.go
+++ b/notifier.go
@@ -7,14 +7,17 @@ type Notifier interface {
 	//
 	// It returns a function that, when called, should un-register `callback`
 	// so that it's no longer called on updates.
-	OnUpdate(callback OnUpdateCallbackFunc) RemoveOnUpdateCallbackFunc
+	OnUpdate(callback NotifierCallbackFunc) RemoveCallbackFunc
 }
 
-type OnUpdateCallbackFunc func()
-type RemoveOnUpdateCallbackFunc func()
+type NotifierCallbackFunc func()
+type RemoveCallbackFunc func()
 
-type NotifierFunc func(callback OnUpdateCallbackFunc) RemoveOnUpdateCallbackFunc
+// UpdateNotifier is a wrapper for a function with the same signature as
+// `Notifier.OnUpdate`, that implements `Notifier` by using itself as the
+// `OnUpdate` method.
+type UpdateNotifier func(callback NotifierCallbackFunc) RemoveCallbackFunc
 
-func (fn NotifierFunc) OnUpdate(callback OnUpdateCallbackFunc) RemoveOnUpdateCallbackFunc {
+func (fn UpdateNotifier) OnUpdate(callback NotifierCallbackFunc) RemoveCallbackFunc {
 	return fn(callback)
 }
diff --git a/statuslineblockprovider.go b/statuslineblockprovider.go
index 2bba1ff..18b462e 100644
--- a/statuslineblockprovider.go
+++ b/statuslineblockprovider.go
@@ -15,7 +15,7 @@ type StatusLineBlockProvider func(ctx context.Context, ch chan<- StatusLineBlock
 func slbpToNotifier(ctx context.Context, p StatusLineBlockProvider) (Notifier, *atomic.Pointer[StatusLineBlock]) {
 	statusProvider := &atomic.Pointer[StatusLineBlock]{}
 
-	source := NotifierFunc(func(callback OnUpdateCallbackFunc) RemoveOnUpdateCallbackFunc {
+	source := UpdateNotifier(func(callback NotifierCallbackFunc) RemoveCallbackFunc {
 		ch := make(chan StatusLineBlock)
 
 		ctxProvider, cancel := context.WithCancelCause(ctx)
diff --git a/time/time.go b/time/time.go
index 6657547..e9fa9d3 100644
--- a/time/time.go
+++ b/time/time.go
@@ -31,7 +31,7 @@ func (tn *Notifier) runCallbacks() {
 
 		// We want this to panic if the conversion can't be done, because that
 		// would mean there's a bug somewhere.
-		callback := value.(dsts.OnUpdateCallbackFunc)
+		callback := value.(dsts.NotifierCallbackFunc)
 
 		callback()
 
@@ -92,7 +92,7 @@ func (tn *Notifier) init() {
 	}
 }
 
-func (tn *Notifier) OnUpdate(callback dsts.OnUpdateCallbackFunc) dsts.RemoveOnUpdateCallbackFunc {
+func (tn *Notifier) OnUpdate(callback dsts.NotifierCallbackFunc) dsts.RemoveCallbackFunc {
 	tn.Lock()
 	defer tn.Unlock()