diff --git a/README.md b/README.md
new file mode 100644
index 0000000..a5322fc
--- /dev/null
+++ b/README.md
@@ -0,0 +1,16 @@
+# firemorph
+
+Migration tool for Firestore
+
+## Gotchas
+
+- 500 Limit https://firebase.google.com/docs/firestore/manage-data/transactions
+
+## Local testing
+
+- FIRESTORE_EMULATOR_HOST="localhost:8080"
+- GCLOUD_PROJECT="lovoo-dna-2"
+
+## Migrations
+
+## CLI
diff --git a/src/index.ts b/src/index.ts
index 9a27384..8689dc2 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -9,7 +9,7 @@ import ms from 'ms'
 const App = admin.initializeApp()
 const DB = admin.firestore()
 const Timestamp = admin.firestore.Timestamp
-const MigrationCollection = DB.collection('migrations')
+const MigrationCollection = DB.collection('_migrations')
 
 export type MigrationFN = (db: FirebaseFirestore.Firestore, firestore: typeof admin.firestore) => Promise<void>
 export type MigrationFile = {