diff --git a/README.md b/README.md
index 8ada5c8..edca410 100644
--- a/README.md
+++ b/README.md
@@ -75,6 +75,14 @@ For Belgium up to zoom 18, it might take >48 hours!
 rsync --compress --recursive ./tiles/cyclosm debian@juniperus.champs-libres.be:/var/lib/mod_tile/cyclosm
 ```
 
+
+#### Troubleshooting
+
+##### Role rendered already exists
+
+While importing, if you encounter the error "createuser: error: creation of new role failed: ERROR:  role "renderer" already exists", it is because the db already exist from a previous import, just remove/rename the `postgres` folder into database.
+
+
 ## Original README
 
 [![Build Status](https://travis-ci.org/Overv/openstreetmap-tile-server.svg?branch=master)](https://travis-ci.org/Overv/openstreetmap-tile-server) [![](https://images.microbadger.com/badges/image/overv/openstreetmap-tile-server.svg)](https://microbadger.com/images/overv/openstreetmap-tile-server "openstreetmap-tile-server")