diff --git a/packages/repco-core/src/datasource.ts b/packages/repco-core/src/datasource.ts
index 088f059f..a46cd054 100644
--- a/packages/repco-core/src/datasource.ts
+++ b/packages/repco-core/src/datasource.ts
@@ -81,9 +81,9 @@ export interface DataSource {
   fetchByUri(uri: string): Promise<SourceRecordForm[] | null>
   fetchByUriBatch(uris: string[]): Promise<SourceRecordForm[]>
   /**
-   * Determines whether the data source is capable of fetching records by UID.
+   * Determines whether the data source is capable of fetching a particular uri
    *
-   * @param uid - The UID of the record to fetch.
+   * @param uri The uri in question
    * @returns `true` if the data source can fetch the record, `false` otherwise.
    */
   canFetchUri(uri: string): boolean
diff --git a/packages/repco-core/src/datasources/cba.ts b/packages/repco-core/src/datasources/cba.ts
index c0dc757a..741d508d 100644
--- a/packages/repco-core/src/datasources/cba.ts
+++ b/packages/repco-core/src/datasources/cba.ts
@@ -375,7 +375,7 @@ export class CbaDataSource implements DataSource {
         type: parts[1],
         id: parts[2],
       }
-    } else if (parts[1] === 'r') {
+    } else if (parts[0] === 'r') {
       if (parts.length !== 4) return null
       return {
         kind: 'revision',