Data-structure.md

@@ -39,7 +39,7 @@ PEP provides a number of predefined column groups and participant groups. Their
 | ---- | -------- | ------- |
 | `*` | All columns @@@ why does this group exist? No one should have access (except perhaps Data Administrator) @@@ | Contents are kept in sync with columns created and removed by Data Administrator. |
 | `Castor` | Columns storing data imported from the [Castor electronic data capture (EDC) system](https://www.castoredc.com/electronic-data-capture-system/). | Managed by Data Administrator. |
-| `CastorShortPseudonyms` | Columns storing [short pseudonyms](Data-structure#short-pseudonyms) that refer to a Castor record. | Automatically kept synchronized with environment configuration. |
+| `CastorShortPseudonyms` | Columns storing [short pseudonyms](Data-structure#short-pseudonyms) that refer to Castor EDC records. | Automatically kept synchronized with environment configuration. |
 | `Device` | Columns storing (wearable) device registration histories. | Automatically kept synchronized with environment configuration. |
 | `ShortPseudonyms` | Columns storing [short pseudonyms](Data-structure#short-pseudonyms). | Automatically kept synchronized with environment configuration. |
 | `VisitAssessors` | Columns storing identifiers for the assessors that administered a(n academic study's) participant measurement session (i.e. visit to the research center). | Automatically kept synchronized with environment configuration. |