diff --git a/.env.sample b/.env.sample
index cd1df38..251966c 100644
--- a/.env.sample
+++ b/.env.sample
@@ -17,7 +17,7 @@ COMPOSE_FILE="compose.yml"
 # –––––––––––––––– REQUIRED ––––––––––––––––
 
 SECRET_DB_PASSWORD_VERSION=v1
-SECRET_SECRET_KEY_VERSION=v1  # length=64
+SECRET_SECRET_KEY_VERSION=v1  # length=64 charset=hex
 SECRET_UTILS_SECRET_VERSION=v1  # length=64
 
 # Set to s3 to use AWS S3 bucket