diff --git a/events.js b/events.js
new file mode 100644
index 0000000..c92d390
--- /dev/null
+++ b/events.js
@@ -0,0 +1,10 @@
+
+/**
+ * Map between op ids and events.
+ */
+
+module.exports = {
+  i: 'insert',
+  u: 'update',
+  d: 'remove'
+};