diff --git a/Dockerfile b/Dockerfile
index 118f038..f979ee2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -58,4 +58,4 @@ EXPOSE 5432
 CMD ["postgres","-c","listen_addresses=*"]
 
 HEALTHCHECK --interval=30s --timeout=3s --retries=4 \
-  CMD pg_isready -U postgres
+  CMD pg_isready -U "${POSTGRES_USER:-postgres}"
diff --git a/README.md b/README.md
index cfff5e3..4778c81 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ If you use the image, you will have to make a mount for the **/data** directory
 
 ### Image Name
 
-The image name for your Docker is **src.ci/srv/postgres:latest**. This is only applicable, if you do not want to change the User ID and Group ID.
+The image name for your Docker is **src.ci/srv/postgres:latest**. This is only applicable, if you do not need to change the User ID and Group ID.
 
 ### ARGS