diff --git a/docker/README.md b/docker/README.md
index 8285a55b..1376a11c 100644
--- a/docker/README.md
+++ b/docker/README.md
@@ -1,6 +1,7 @@
 # Terracotta docker
 
-This directory contains the files to build the Terracotta docker image. This image can be used to serve the tile server or the client depending on the value of the environment variable `TERRACOTTA_SERVICE`. By default, the tiler server is started.
+This directory contains the files to build the Terracotta docker image. This image can be used to serve the tile server.
+It can also be used to connect to a running terracotta tiler and serve the client depending on the value of the environment variable `TERRACOTTA_SERVICE`. By default, the tiler server is started.
 
 ## Build the image