diff --git a/klausur-service/backend/migrations/005_add_doc_type.sql b/klausur-service/backend/migrations/005_add_doc_type.sql
new file mode 100644
index 0000000..e5b7a00
--- /dev/null
+++ b/klausur-service/backend/migrations/005_add_doc_type.sql
@@ -0,0 +1,7 @@
+-- Migration 005: Add document type detection columns
+-- These columns store the result of automatic document type detection
+-- (vocab_table, full_text, generic_table) after dewarp.
+
+ALTER TABLE ocr_pipeline_sessions
+ADD COLUMN IF NOT EXISTS doc_type VARCHAR(50),
+ADD COLUMN IF NOT EXISTS doc_type_result JSONB;