diff --git a/config.sh.example b/config.sh.example
index 9ed0e42..63d9ebc 100644
--- a/config.sh.example
+++ b/config.sh.example
@@ -1,2 +1,4 @@
-CA="https://acme-v01.api.letsencrypt.org"
+# default values are commented
+
+#CA="https://acme-v01.api.letsencrypt.org"
 WELLKNOWN="/var/www/letsencrypt/.well-known/acme-challenge"
diff --git a/letsencrypt.sh b/letsencrypt.sh
index 90174c9..17f5ab3 100755
--- a/letsencrypt.sh
+++ b/letsencrypt.sh
@@ -4,6 +4,9 @@ set -e
 set -u
 set -o pipefail
 
+# default config values
+CA="https://acme-v01.api.letsencrypt.org"
+
 . ./config.sh
 
 umask 077 # paranoid umask, we're creating private keys