diff --git a/Dockerfile b/Dockerfile
index ee823b5..28e7764 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 #
-# simple postfix smarthost smtp relay
+# simple postfix smtp relay
 #
 
 FROM alpine:3.13
@@ -9,12 +9,12 @@ LABEL author="Asif Bacchus <asif@bacchus.cloud>"
 LABEL maintainer="Asif Bacchus <asif@bacchus.cloud>"
 LABEL org.label-schema.schema-version="1.0"
 LABEL org.label-schema.docker.cmd=""
-LABEL org.label-schema.description="Simple postfix smarthost smtp mail relay on Alpine Linux."
-LABEL org.label-schema.url=""
-LABEL org.label-schema.usage=""
-LABEL org.label-schema.vcs-url=""
+LABEL org.label-schema.description="Simple postfix smtp mail relay on Alpine."
+LABEL org.label-schema.url="https://git.asifbacchus.app/ab-docker/postfix-smtp-relay"
+LABEL org.label-schema.usage="https://git.asifbacchus.app/ab-docker/postfix-smtp-relay"
+LABEL org.label-schema.vcs-url="https://git.asifbacchus.app/ab-docker/postfix-smtp-relay.git"
 
-# install mSMTP
+# install packages and clean-up
 RUN apk --no-cache add \
     ca-certificates \
     postfix \
@@ -41,8 +41,8 @@ ENTRYPOINT [ "/usr/local/bin/entrypoint.sh" ]
 CMD [ "/usr/local/sbin/postfix", "start-fg" ]
 
 # set parameters, vendor, version and build-date labels
-LABEL org.label-schema.docker.params="TZ=Etc/UTC, HOSTNAME=HOSTNAME, DOMAINNAME=(derived from hostname), LOCAL_ENCRYPTION=false, SMARTHOST, SMARTHOST_PORT=587, SMARTHOST_USERNAME, SMARTHOST_PASSWORD, SMARTHOST_ENCRYPTION='OPTIONAL'"
+LABEL org.label-schema.docker.params="TZ=Etc/UTC, HOSTNAME=(container hostname), DOMAINNAME=(derived from hostname), LOCAL_ENCRYPTION=false|optional|true, SMARTHOST=..., SMARTHOST_PORT=587, SMARTHOST_USERNAME=..., SMARTHOST_PASSWORD=..., SMARTHOST_ENCRYPTION=optional|false|true"
 LABEL org.label-schema.vendor="Alpine 3.13, Postfix 3.5.10-r0"
-LABEL org.label-schema.version="0.1"
+LABEL org.label-schema.version="0.5"
 ARG BUILD_DATE
 LABEL org.label-schema.build-date=${BUILD_DATE}