Update README.md

README.md

@@ -57,7 +57,7 @@ Each JSON entry describes one utterance:
 | `speaker_id` | string | Speaker identifier. |
 | `sentence_id` | string | Reference sentence ID (matches `reference_transcriptions.txt`). |
 | `phone_ids` | sequence[string] | Unique phone identifiers per utterance. |
-| `reference` | sequence[string] | MFA reference phones. |
+| `reference` | sequence[string] | reference phones assigned to match the closer aimed pronunciation by the speaker. |
 | `annot_1` | sequence[string] | Annotator 1 phones (`-` marks deletions). |
 | `annot_2` | sequence[string] | Annotator 3 phones when available, empty otherwise. |
 | `label_1` | sequence[string] | Annotator 1 phone labels (`"1"` correct, `"0"` incorrect). |