diff --git a/docker/Dockerfile b/docker/Dockerfile
index e6982af0..a8a2130a 100755
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,6 +1,6 @@
 FROM busybox:stable
 
-ARG S6_OVERLAY_VERSION=3.1.1.2
+ARG S6_OVERLAY_VERSION=3.2.0.0
 ARG S6_ARCH=x86_64
 ADD https://github.com/just-containers/s6-overlay/releases/download/v${S6_OVERLAY_VERSION}/s6-overlay-noarch.tar.xz /tmp
 ADD https://github.com/just-containers/s6-overlay/releases/download/v${S6_OVERLAY_VERSION}/s6-overlay-${S6_ARCH}.tar.xz /tmp
@@ -12,8 +12,8 @@ RUN \
 
 COPY rootfs /
 
-ENV RELAY relay.example.com
-ENV ENCRYPTED_ONLY 0
+ENV RELAY=relay.example.com
+ENV ENCRYPTED_ONLY=0
 
 EXPOSE 21115 21116 21116/udp 21117 21118 21119
 
diff --git a/src/main.rs b/src/main.rs
index 06ee4820..f29252d2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -72,9 +72,9 @@ fn main() -> ResultType<()> {
         -a, --api-port=[NUMBER(default={API_PORT})] 'Sets the listening port of API server'
         -p, --port=[NUMBER(default={RENDEZVOUS_PORT})] 'Sets the listening port'
         -s, --serial=[NUMBER(default=0)] 'Sets configure update serial number'
-        -R, --rendezvous-servers=[HOSTS] 'Sets rendezvous servers, separated by colon'
+        -R, --rendezvous-servers=[HOSTS] 'Sets rendezvous servers, separated by comma'
         -u, --software-url=[URL] 'Sets download url of RustDesk software of newest version'
-        -r, --relay-servers=[HOST] 'Sets the default relay servers, separated by colon'
+        -r, --relay-servers=[HOST] 'Sets the default relay servers, separated by comma'
         -M, --rmem=[NUMBER(default={RMEM})] 'Sets UDP recv buffer size, set system rmem_max first, e.g., sudo sysctl -w net.core.rmem_max=52428800. vi /etc/sysctl.conf, net.core.rmem_max=52428800, sudo sysctl –p'
         , --mask=[MASK] 'Determine if the connection comes from LAN, e.g. 192.168.0.0/16'
         -k, --key=[KEY] 'Only allow the client with the same key'",