diff --git a/README.md b/README.md
index 5d8ca20..7bd997a 100644
--- a/README.md
+++ b/README.md
@@ -99,10 +99,10 @@ SASV9_OPTIONS= -NOXCMD
 ## Additional Web Server Options
 #
 
-# ENV variables required for PROTOCOL: `https`
-PRIVATE_KEY=privkey.pem
-CERT_CHAIN=certificate.pem
-CA_ROOT=fullchain.pem
+# ENV variables for PROTOCOL: `https`
+PRIVATE_KEY=privkey.pem (required)
+CERT_CHAIN=certificate.pem (required)
+CA_ROOT=fullchain.pem (optional)
 
 # ENV variables required for MODE: `server`
 ACCESS_TOKEN_SECRET=<secret>
diff --git a/api/.env.example b/api/.env.example
index d11bd43..f38b982 100644
--- a/api/.env.example
+++ b/api/.env.example
@@ -4,7 +4,8 @@ WHITELIST=<space separated urls, each starting with protocol `http` or `https`>
 
 PROTOCOL=[http|https] default considered as http
 PRIVATE_KEY=privkey.pem
-FULL_CHAIN=fullchain.pem
+CERT_CHAIN=certificate.pem
+CA_ROOT=fullchain.pem
 
 PORT=[5000] default value is 5000