diff --git a/docs/_specification/1.2-DRAFT/structure.md b/docs/_specification/1.2-DRAFT/structure.md
index e9302fdf..f7b7ccca 100644
--- a/docs/_specification/1.2-DRAFT/structure.md
+++ b/docs/_specification/1.2-DRAFT/structure.md
@@ -108,7 +108,7 @@ The name of the _RO-Crate root_ directory is not defined, but a root directory i
 
 The payload directory (and its child directory) contains files and directories that SHOULD be described within the _RO-Crate Metadata File_ as [Data Entities](data-entities). Additional [Web-based Data Entities](data-entities.html#web-based-data-entities) MAY also be described, but are not considered part of the payload.
 
-The `@id` of a an _Attached  RO-Crate Package_ MUST be either `./` or be a URI, such as a DOI URL or other persistent URL which is considered to be the main identifier of the Attached  RO-Crate Package.
+The `@id` of the _Root Data Entity_ in an _Attached  RO-Crate Package_ MUST be either `./` or be a URI, such as a DOI URL or other persistent URL which is considered to be the main identifier of the Attached  RO-Crate Package.
 
 {% include callout.html type="note" content="Earlier versions of RO-Crate mandated an `@id` of `./` as a convention for identifying the _Root Data Entity_, but the use of the _RO-Crate Metadata Descriptor_ means that this is no longer required, freeing-up the _Root Data Entity_ `@id` to be used to indicate what should be considered the canonical URI for an RO_Crate Package. Other mechanisms for specifying the 'main identifier' involve multiple JSON-LD entities and may be ambiguous." %}