update docs

packages/tswebextension/src/lib/common/storage/extension-storage-decorator.ts

@@ -16,6 +16,10 @@ export function createExtensionStorageDecorator<Data extends Record<string, unkn
     /**
      * Creates accessor decorator for the specified storage field.
      *
+     * NOTE: You should not set the initial value to the accessor via assignment,
+     * because decorator overwrite accessors methods and don't use private property, created on initialization.
+     * Use Non-null assertion operator instead.
+     * @example `@storage('foo') accessor bar!: string`;
      * @param field Storage field name.
      * @throws Error if decorator is already registered for {@link field}
      * or decorator is applied to class member different from auto accessor.