diff --git a/store/memory.go b/store/memory.go
index d4e2351..089fd12 100644
--- a/store/memory.go
+++ b/store/memory.go
@@ -8,6 +8,8 @@ import (
 	"github.com/google/uuid"
 )
 
+var _ Store = &MemoryStore{}
+
 type MemoryStore struct {
 	data map[string][]byte
 }
@@ -44,3 +46,12 @@ func (s *MemoryStore) Get(id string) (io.ReadCloser, error) {
 
 	return r, nil
 }
+
+func (s *MemoryStore) List() ([]string, error) {
+	var ids []string
+	for id := range s.data {
+		ids = append(ids, id)
+	}
+
+	return ids, nil
+}
diff --git a/store/store.go b/store/store.go
index c4482d6..b086c59 100644
--- a/store/store.go
+++ b/store/store.go
@@ -11,4 +11,5 @@ type Store interface {
 	Add(r io.Reader) (string, error)
 	Delete(id string) error
 	Get(id string) (io.ReadCloser, error)
+	List() ([]string, error)
 }