diff --git a/plan/storage/memory/localid.go b/plan/storage/memory/localid.go
index 40024b1..838e80a 100644
--- a/plan/storage/memory/localid.go
+++ b/plan/storage/memory/localid.go
@@ -1,6 +1,7 @@
 package memory
 
 import (
+	"errors"
 	"sync"
 
 	"go-mod.ewintr.nl/planner/plan/storage"
@@ -24,6 +25,33 @@ func (ml *LocalID) FindAll() (map[string]int, error) {
 	return ml.ids, nil
 }
 
+func (ml *LocalID) Find(id string) (int, error) {
+	ml.mutex.RLock()
+	defer ml.mutex.RUnlock()
+
+	lid, ok := ml.ids[id]
+	if !ok {
+		return 0, storage.ErrNotFound
+	}
+
+	return lid, nil
+}
+
+func (ml *LocalID) FindOrNext(id string) (int, error) {
+	ml.mutex.Lock()
+	defer ml.mutex.Unlock()
+
+	lid, err := ml.Find(id)
+	switch {
+	case errors.Is(err, storage.ErrNotFound):
+		return ml.Next()
+	case err != nil:
+		return 0, err
+	default:
+		return lid, nil
+	}
+}
+
 func (ml *LocalID) Next() (int, error) {
 	ml.mutex.RLock()
 	defer ml.mutex.RUnlock()
diff --git a/plan/storage/memory/localid_test.go b/plan/storage/memory/localid_test.go
index 02d060e..f750e30 100644
--- a/plan/storage/memory/localid_test.go
+++ b/plan/storage/memory/localid_test.go
@@ -37,6 +37,15 @@ func TestLocalID(t *testing.T) {
 		t.Errorf("exp nil, got %v", actErr)
 	}
 
+	t.Log("retrieve known")
+	actLid, actErr := repo.FindOrNext("test")
+	if actErr != nil {
+		t.Errorf("exp nil, got %v", actErr)
+	}
+	if actLid != 1 {
+		t.Errorf("exp 1, git %v", actLid)
+	}
+
 	actIDs, actErr = repo.FindAll()
 	if actErr != nil {
 		t.Errorf("exp nil, got %v", actErr)
diff --git a/plan/storage/storage.go b/plan/storage/storage.go
index c7bfdd9..cdb9907 100644
--- a/plan/storage/storage.go
+++ b/plan/storage/storage.go
@@ -13,6 +13,7 @@ var (
 
 type LocalID interface {
 	FindAll() (map[string]int, error)
+	FindOrNext(id string) (int, error)
 	Next() (int, error)
 	Store(id string, localID int) error
 	Delete(id string) error