diff --git a/backend/src/main/resources/db/migration/V48__add_index_transcription_blocks_document_reviewed.sql b/backend/src/main/resources/db/migration/V48__add_index_transcription_blocks_document_reviewed.sql
new file mode 100644
index 00000000..ff495630
--- /dev/null
+++ b/backend/src/main/resources/db/migration/V48__add_index_transcription_blocks_document_reviewed.sql
@@ -0,0 +1,2 @@
+CREATE INDEX IF NOT EXISTS idx_transcription_blocks_document_reviewed
+    ON transcription_blocks (document_id, reviewed);