diff --git a/packages/core/src/commands/clearContent.ts b/packages/core/src/commands/clearContent.ts
index 479b1596..a925cb45 100644
--- a/packages/core/src/commands/clearContent.ts
+++ b/packages/core/src/commands/clearContent.ts
@@ -6,7 +6,7 @@ declare module '@tiptap/core' {
       /**
        * Clear the whole document.
        */
-      clearContent: (emitUpdate: Boolean) => Command,
+      clearContent: (emitUpdate?: Boolean) => Command,
     }
   }
 }