diff --git a/README.md b/README.md
index ca1ea9d..8e5b849 100644
--- a/README.md
+++ b/README.md
@@ -12,13 +12,24 @@ Automatically generates Let's Encrypt certificates using a lightweight Docker co
 
 * `DUCKDNS_TOKEN`: Duck DNS account token (obtained from [Duck DNS](https://www.duckdns.org)) (*required*)
 * `DUCKDNS_DOMAIN`: Full Duck DNS domain (e.g. `test.duckdns.org`) (*required*)
+* `LETSENCRYPT_DOMAIN`: Domain to generate SSL cert for. By default the SSL certificate is generated for `DUCKDNS_DOMAIN` (optional)
+* `LETSENCRYPT_WILDCARD`: `true` or `false`, indicating whether the SSL certificate should be for subdomains *only* of `LETSENCRYPT_DOMAIN` (i.e. `*.test.duckdns.org`), or for the main domain *only* (i.e. `test.duckdns.org`) (optional, default: `false`)
 * `LETSENCRYPT_EMAIL`: Email used for certificate renewal notifications (optional)
-* `LETSENCRYPT_WILDCARD`: `true` or `false`, indicating whether the SSL certificate should be for subdomains *only* of `DUCKDNS_DOMAIN` (i.e. `*.test.duckdns.org`), or for the main domain *only* (i.e. `test.duckdns.org`) (optional, default: `false`)
 * `TESTING`: `true` or `false`, indicating whether a staging SSL certificate should be generated or not (optional, default: `false`)
 * `UID`: User ID to apply to Let's Encrypt files generated (optional, recommended, default: `0` - root)
 * `GID`: Group ID to apply to Let's Encrypt files generated (optional, recommended, default: `0` - root)
 
-**Note:** The format of `DUCKDNS_DOMAIN` should be the same regardless of the value of `LETSENCRYPT_WILDCARD`.
+## Notes
+
+* The `DUCKDNS_DOMAIN` should already be pointing to the server with a dynamic IP. The [maksimstojkovic/duckdns](https://github.com/maksimstojkovic/docker-duckdns) image can be used to automatically update the IP address.
+* The format of `DUCKDNS_DOMAIN` should be `<subdomain>.duckdns.org`, regardless of the value of `LETSENCRYPT_WILDCARD`.
+* To use `LETSENCRYPT_DOMAIN` feature, the following DNS records need to be created for ACME authentication (records should not be proxied):
+
+| Type  | Name                                   | Value                              | Condition                         |
+|-------|----------------------------------------|------------------------------------|-----------------------------------|
+| CNAME | `*.<LETSENCRYPT_DOMAIN>`               | `<DUCKDNS_DOMAIN>`                 | `LETSENCRYPT_WILDCARD` == `true`  |
+| CNAME | `<LETSENCRYPT_DOMAIN>`                 | `<DUCKDNS_DOMAIN>`                 | `LETSENCRYPT_WILDCARD` == `false` |
+| CNAME | `_acme-challenge.<LETSENCRYPT_DOMAIN>` | `_acme-challenge.<DUCKDNS_DOMAIN>` |                                   |
 
 ## Volumes
 
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..73dc015
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,27 @@
+version: '2.4'
+
+services:
+  duckdns:
+    image: maksimstojkovic/duckdns
+    container_name: duckdns
+    environment:
+      - DUCKDNS_TOKEN=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
+      - DUCKDNS_DOMAIN=test.duckdns.org
+      - DUCKDNS_DELAY=5 #optional
+    restart: unless-stopped
+
+  letsencrypt:
+    image: maksimstojkovic/letsencrypt
+    container_name: letsencrypt
+    volumes:
+      - ./certs:/etc/letsencrypt
+    environment:
+      - DUCKDNS_TOKEN=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
+      - DUCKDNS_DOMAIN=test.duckdns.org
+      - LETSENCRYPT_DOMAIN= #optional
+      - LETSENCRYPT_WILDCARD=false #optional
+      - LETSENCRYPT_EMAIL= #optional
+      - TESTING=false #optional
+      - UID=0 #optional
+      - GID=0 #optional
+    restart: unless-stopped
diff --git a/scripts/auth.sh b/scripts/auth.sh
index e552aec..5ee98c9 100644
--- a/scripts/auth.sh
+++ b/scripts/auth.sh
@@ -1,3 +1,3 @@
 #!/bin/sh
-[[ "$(curl -s "https://www.duckdns.org/update?domains=${CERTBOT_DOMAIN%.duckdns.org}&token=${DUCKDNS_TOKEN}&txt=${CERTBOT_VALIDATION}")" = "OK" ]]
+[[ "$(curl -s "https://www.duckdns.org/update?domains=${DUCKDNS_DOMAIN%.duckdns.org}&token=${DUCKDNS_TOKEN}&txt=${CERTBOT_VALIDATION}")" = "OK" ]]
 
diff --git a/scripts/cleanup.sh b/scripts/cleanup.sh
index 0bce0a1..da92885 100644
--- a/scripts/cleanup.sh
+++ b/scripts/cleanup.sh
@@ -1,2 +1,2 @@
 #!/bin/sh
-[[ "$(curl -s "https://www.duckdns.org/update?domains=${CERTBOT_DOMAIN%.duckdns.org}&token=${DUCKDNS_TOKEN}&txt=${CERTBOT_VALIDATION}&clear=true")" = "OK" ]]
+[[ "$(curl -s "https://www.duckdns.org/update?domains=${DUCKDNS_DOMAIN%.duckdns.org}&token=${DUCKDNS_TOKEN}&txt=${CERTBOT_VALIDATION}&clear=true")" = "OK" ]]
diff --git a/scripts/start.sh b/scripts/start.sh
index 49900b5..0227112 100644
--- a/scripts/start.sh
+++ b/scripts/start.sh
@@ -1,44 +1,50 @@
 #!/bin/sh
 
 # Check variables DUCKDNS_TOKEN, DUCKDNS_DOMAIN
-if [ -z "$DUCKDNS_TOKEN" ]; then
-	echo "ERROR: Variable DUCKDNS_TOKEN is unset"
-	exit 1
+if [ -z "$DUCKDNS_TOKEN" ] || [ "$DUCKDNS_TOKEN" = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX" ]; then
+  echo "ERROR: Variable DUCKDNS_TOKEN is unset or still its default value"
+  exit 1
 fi
 
 if [ -z "$DUCKDNS_DOMAIN" ]; then
-	echo "ERROR: Variable DUCKDNS_DOMAIN is unset"
-	exit 1
+  echo "ERROR: Variable DUCKDNS_DOMAIN is unset or still its default value"
+  exit 1
 fi
 
 # Print email notice if applicable
 if [ -z "$LETSENCRYPT_EMAIL" ]; then
-	echo "INFO: You will not receive SSL certificate expiration notices"
+  echo "WARNING: You will not receive SSL certificate expiration notices"
+fi
+
+# Set LETSENCRYPT_DOMAIN to DUCKDNS_DOMAIN if not specified
+if [ -z "$LETSENCRYPT_DOMAIN" ]; then
+  echo "INFO: LETSENCRYPT_DOMAIN is unset, using DUCKDNS_DOMAIN"
+  LETSENCRYPT_DOMAIN=$DUCKDNS_DOMAIN
 fi
 
 # Set certificate url based on LETSENCRYPT_WILDCARD value
 if [ "$LETSENCRYPT_WILDCARD" = "true" ]; then
   echo "INFO: A wildcard SSL certificate will be created"
-  LETSENCRYPT_DOMAIN="*.$DUCKDNS_DOMAIN"
+  LETSENCRYPT_DOMAIN="*.$LETSENCRYPT_DOMAIN"
 else
-  LETSENCRYPT_DOMAIN="$DUCKDNS_DOMAIN"
   LETSENCRYPT_WILDCARD="false"
 fi
 
 # Set user and group ID's for files
 if [ -z "$UID" ]; then
-	echo "INFO: No UID specified, using root UID of 0"
+  echo "INFO: No UID specified, using root UID of 0"
   UID=0
 fi
 
 if [ -z "$GID" ]; then
-	echo "INFO: No GID specified, using root GID of 0"
+  echo "INFO: No GID specified, using root GID of 0"
   GID=0
 fi
 
 # Print variables
 echo "DUCKDNS_TOKEN: $DUCKDNS_TOKEN"
 echo "DUCKDNS_DOMAIN: $DUCKDNS_DOMAIN"
+echo "LETSENCRYPT_DOMAIN: $LETSENCRYPT_DOMAIN"
 echo "LETSENCRYPT_EMAIL: $LETSENCRYPT_EMAIL"
 echo "LETSENCRYPT_WILDCARD: $LETSENCRYPT_WILDCARD"
 echo "TESTING: $TESTING"
@@ -58,23 +64,25 @@ else
   unset TEST_PARAM
 fi
 
-echo "certbot certonly --manual --preferred-challenges dns --manual-auth-hook \
-  /scripts/auth.sh --manual-cleanup-hook /scripts/cleanup.sh \
+echo "certbot certonly --manual --preferred-challenges dns \
+  --manual-auth-hook /scripts/auth.sh \
+  --manual-cleanup-hook /scripts/cleanup.sh \
   $EMAIL_PARAM -d $LETSENCRYPT_DOMAIN \
   --agree-tos --manual-public-ip-logging-ok --keep $TEST_PARAM"
 
 # Create certificates
-certbot certonly --manual --preferred-challenges dns --manual-auth-hook \
-  /scripts/auth.sh --manual-cleanup-hook /scripts/cleanup.sh \
+certbot certonly --manual --preferred-challenges dns \
+  --manual-auth-hook /scripts/auth.sh \
+  --manual-cleanup-hook /scripts/cleanup.sh \
   $EMAIL_PARAM -d $LETSENCRYPT_DOMAIN \
   --agree-tos --manual-public-ip-logging-ok --keep $TEST_PARAM
 
 chown -R $UID:$GID /etc/letsencrypt
 
 # Check for successful certificate generation
-if [ ! -d "/etc/letsencrypt/live/${DUCKDNS_DOMAIN}" ] || \
-   [ ! -f "/etc/letsencrypt/live/${DUCKDNS_DOMAIN}/fullchain.pem" ] || \
-   [ ! -f "/etc/letsencrypt/live/${DUCKDNS_DOMAIN}/privkey.pem" ]; then
+if [ ! -d "/etc/letsencrypt/live/${LETSENCRYPT_DOMAIN#\*\.}" ] || \
+   [ ! -f "/etc/letsencrypt/live/${LETSENCRYPT_DOMAIN#\*\.}/fullchain.pem" ] || \
+   [ ! -f "/etc/letsencrypt/live/${LETSENCRYPT_DOMAIN#\*\.}/privkey.pem" ]; then
   echo "ERROR: Failed to create SSL certificates"
   exit 1
 fi