[ci skip] Clarify how sequelize.Promise works with other a+/promise libs

lib/promise.js

@@ -15,6 +15,9 @@ var Promise = require('bluebird/js/main/promise')() // use this syntax to be abl
  * A slightly modified version of bluebird promises. This means that, on top of the methods below, you can also call all the methods listed on the link below.
  *
  * The main difference is that sequelize promises allows you to attach a listener that will be called with the generated SQL, each time a query is run.
+ * 
+ * The sequelize promise class works seamlessly with other A+/thenable libraries, with one exception.
+ * If you want to propagate SQL events across `then`, `all` calls etc., you must use sequelize promises exclusively. 
  *
  * @mixes https://github.com/petkaantonov/bluebird/blob/master/API.md
  * @class Promise