Improved documentation (#7102)

docs/docs/associations.md

@@ -203,7 +203,7 @@ User.belongsToMany(Project, {through: 'UserProject'});
 
 
 This will create a new model called UserProject with the equivalent foreign keys `projectId` and `userId`. Whether the attributes are camelcase or not depends on the two models joined by the table (in this case User and Project).
 This will create a new model called UserProject with the equivalent foreign keys `projectId` and `userId`. Whether the attributes are camelcase or not depends on the two models joined by the table (in this case User and Project).
 
 
-Defining `through` is required. Sequelize would previously attempt to autogenerate names but that would not always lead to the most logical setups.
+Defining `through` is **required**. Sequelize would previously attempt to autogenerate names but that would not always lead to the most logical setups.
 
 
 This will add methods `getUsers`, `setUsers`, `addUser`,`addUsers` to `Project`, and `getProjects`, `setProjects`, `addProject`, and `addProjects` to `User`.
 This will add methods `getUsers`, `setUsers`, `addUser`,`addUsers` to `Project`, and `getProjects`, `setProjects`, `addProject`, and `addProjects` to `User`.