diff --git a/srv/.env.sample b/srv/.env.sample
index 99daa8a..57ec7ed 100644
--- a/srv/.env.sample
+++ b/srv/.env.sample
@@ -1,6 +1,5 @@
 # Copy this file to a new file named ".env". The .env file is not committed to the source control.
 NODE_ENV=develop
-
 HUB_DATABASE=mongodb://localhost:27017
 PORT=5050
 
@@ -10,6 +9,7 @@ MAXSIZE=16kb
 
 # List of DID admin accounts separated by ";".
 ADMIN=did:is:71f5a5bc254a14d3862896a44856f14b72e433f204b74ca39351bfcbd77dafdf,did:is:e485bafb1091bd871bbee6f0883fc938bc68af3987eac23417b606379bc92148
+JWT_KEY=
 
 # Other DID Servers to sync with, semi-colon separated.
 # EXAMPLE: SERVERS=http://127.0.0.1:4350;http://127.0.0.1:4251