diff --git a/src/lib/types/cluster.ts b/src/lib/types/cluster.ts
index c8a1ae5..10840be 100644
--- a/src/lib/types/cluster.ts
+++ b/src/lib/types/cluster.ts
@@ -13,6 +13,7 @@ export interface ClusterInterface extends Iterable<AtomInterface> {
 export interface ClusterMapInterface {
   getNeighbourhood(atom: AtomInterface): ClusterInterface[];
   countAtoms(): number;
+  clear(): void;
   handleAtom(atom: AtomInterface): ClusterInterface;
   getCluster(clusterCoords: NumericVector): ClusterInterface;
 }