diff --git a/lib/migrations/migration.js b/lib/migrations/migration.js
index 0ade2207..5f39afc2 100644
--- a/lib/migrations/migration.js
+++ b/lib/migrations/migration.js
@@ -38,7 +38,7 @@ class AbstractMigration {
   /**
    * Run the actual migration
    * @param {Batch} b
-   * @param {MigrationContext} [ctx]
+   * @param {MigrationContext} ctx
    * @returns {Promise}
    */