diff --git a/src/common/types.ts b/src/common/types.ts
index 42ae631..e38eb2b 100644
--- a/src/common/types.ts
+++ b/src/common/types.ts
@@ -161,7 +161,7 @@ export interface SRIBioEntity {
   // "main" semantic types for this entity, first is always the SRI-preferred type
   primaryTypes: string[];
   semanticTypes: string[]; // all types for this entity, up the hierarchy
-  attributes: DBIdsObject; // attributes attached to this entity
+  attributes?: DBIdsObject; // attributes attached to this entity
 }
 
 export interface IdentifierObject {
diff --git a/src/index.ts b/src/index.ts
index c34283e..43605f0 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -7,6 +7,8 @@ import { _resolveSRI } from './sri';
 import { _getAttributes } from './attrs';
 import SRIResolverFailiureImport from './exceptions/sri_resolver_failiure';
 
+export * from './common/types';
+
 export class Resolver implements IResolver {
   private _resolver: IResolver;
   constructor(type: string = undefined) {