README.md in phobos_db_checkpoint-2.2.0 vs README.md in phobos_db_checkpoint-2.3.0

@@ -297,9 +297,13 @@
   * retry_count
   * checksum
 
 ## <a name="upgrading"></a> Upgrading
 
+#### From 2.2.0 >= _version_ >= 2.0.0 to 2.3.0
+
+The database table for Event has had created_at added to it, run `phobos_db_checkpoint copy-migrations` in your project to receive the migration.
+
 #### From <2.0 to 2.x
 
 ##### Rename database tables
 
 The database table names for Event and Failure has been changed to be namespaced under `phobos_db_checkpoint_` to avoid potential collisions with projects that already have these names.