diff --git a/bin/utils.cjs b/bin/utils.cjs
index 6ca7804..a726c43 100644
--- a/bin/utils.cjs
+++ b/bin/utils.cjs
@@ -100,7 +100,7 @@ export const setContentInitializor = (f) => {
   contentInitializor = f
 }
 
-class WSSharedDoc extends Y.Doc {
+export class WSSharedDoc extends Y.Doc {
   /**
    * @param {string} name
    */