diff --git a/acme/README.md b/acme/README.md
index f2271e2..ba70204 100644
--- a/acme/README.md
+++ b/acme/README.md
@@ -1,22 +1,21 @@
 # ACME - snippet to obtain let´s encrpyt certificates authenticated by DNS-01
 
+## Prerequisites
+* bash
+* curl
+* openssl
+* cron
+
 ## Dockerfile:
 ```
 ADD ./snippets/acme/dehydrated /dehydrated/
 ADD ./snippets/acme/config /dehydrated/config
 ADD ./snippets/acme/get_cert_ddns01.sh /app/get_cert_ddns01.sh
 ADD ./snippets/acme/zwackl_hook.sh /app/zwackl_hook.sh
+ADD ./snippets/acme/cronjob.daily /etc/periodic/daily/acme
 ```
 **Do not forget to include the cron snippet!**
 
-## Cronjob
-`/etc/periodic/daily/acme`:
-```
-#!/bin/bash
-
-. /cron_env && /dehydrated/dehydrated --cron -t dns-01 -k /app/zwackl_hook.sh && ${ACME_RELOAD_CMD}
-```
-
 ## Environment
 * ACME_FQDNS (required)
 * ACME_RELOAD_CMD (required)
@@ -24,3 +23,4 @@ ADD ./snippets/acme/zwackl_hook.sh /app/zwackl_hook.sh
 * STAGING_URI (optional)
 * DDNS01URI (required)
 * DDNS01KEY (required)
+* DDNS01_ONECERT (optional)
diff --git a/acme/get_cert_ddns01.sh b/acme/get_cert_ddns01.sh
index 2b7f855..83a810c 100755
--- a/acme/get_cert_ddns01.sh
+++ b/acme/get_cert_ddns01.sh
@@ -40,7 +40,6 @@ if [ ! -z "${ACME_FQDNS+x}" ]; then
     fi
     echo -n "" > /dehydrated/domains.txt
     for fqdn in ${ACME_FQDNS}; do
-      echo "${fqdn}"
       echo "${ONELINE}" "${fqdn} " >> /dehydrated/domains.txt
       if [ ! -d "/secrets/ssl/${fqdn}" ]; then
         install -d -m 775 "/secrets/ssl/${fqdn}"
@@ -64,7 +63,6 @@ if [ ! -z "${ACME_FQDNS+x}" ]; then
     if [ ! -z "${RUN_DEHYDRATED}" ]; then
       /dehydrated/dehydrated --cron -t dns-01 -k /app/zwackl_hook.sh
     fi
-    export CROND_ENABLE='acme'
     chmod -R +x /dehydrated/certs
   else
     echo "Directory /dehydrated not found!"
diff --git a/cron/start_cron.sh b/cron/start_cron.sh
index 03f915d..763ed4c 100755
--- a/cron/start_cron.sh
+++ b/cron/start_cron.sh
@@ -1,29 +1,27 @@
 #!/bin/sh
 
-if [ ! -z "${CROND_ENABLE+x}" ]; then
-  # serialize ENV for cron-jobs
-  TMP_FILE=/tmp/cron_env
-  OUT_FILE=/cron_env
-  echo -n '' > "${OUT_FILE}"
-  env > "${TMP_FILE}"
-  while read -r line; do
-    echo "${line}" | grep -q "^PWD="
-    if [ $? = 0 ]; then
-      continue
-    fi
-    echo "${line}" | grep -q "\s"
-    if [ $? = 0 ]; then
-      # double-quote blank separated values for $(export)
-      # 1. awk: replace first(!) appearance of = with ="
-      # 2. awk: replace end of line with double-quotes
-      QUOTED=$(echo "${line}" | awk '{sub(/=/,"=\"");}1'| awk '{sub(/$/,"\"");}1')
-      echo "export ${QUOTED}" >> "${OUT_FILE}"
-    else
-      echo "export ${line}" >> "${OUT_FILE}"
-    fi
-  done <"${TMP_FILE}"
-  unlink "${TMP_FILE}"
-  # start crond in background
-  /usr/sbin/crond -b -S
-fi
+# serialize ENV for cron-jobs
+TMP_FILE=/tmp/cron_env
+OUT_FILE=/cron_env
+echo -n '' > "${OUT_FILE}"
+env > "${TMP_FILE}"
+while read -r line; do
+  echo "${line}" | grep -q "^PWD="
+  if [ $? = 0 ]; then
+    continue
+  fi
+  echo "${line}" | grep -q "\s"
+  if [ $? = 0 ]; then
+    # double-quote blank separated values for $(export)
+    # 1. awk: replace first(!) appearance of = with ="
+    # 2. awk: replace end of line with double-quotes
+    QUOTED=$(echo "${line}" | awk '{sub(/=/,"=\"");}1'| awk '{sub(/$/,"\"");}1')
+    echo "export ${QUOTED}" >> "${OUT_FILE}"
+  else
+    echo "export ${line}" >> "${OUT_FILE}"
+  fi
+done <"${TMP_FILE}"
+unlink "${TMP_FILE}"
+# start crond in background
+/usr/sbin/crond -b -S