Update upgrade46-47.md

docs/upgrade-guide/upgrade46-47.md

@@ -87,3 +87,10 @@ After starting the app, if everything is working fine, that's all and you don't
     ```sh
     npm install
     ```
+
+### Style Update
+
+Some change has been necessary in order to preper ADF for the next versions of Angular. Check the update theming page in to check how to update your custom style:
+https://github.com/Alfresco/alfresco-ng2-components/blob/develop/docs/user-guide/theming.md
+
+