diff --git a/charts/wonderwall/values.yaml b/charts/wonderwall/values.yaml
index 0103edf..cfb7c05 100644
--- a/charts/wonderwall/values.yaml
+++ b/charts/wonderwall/values.yaml
@@ -17,6 +17,8 @@ azure:
   redisSecretName: wonderwall-azure-redis-rw
   forwardAuth: false
   sessionCookieName: forwardauth
+  # 256 bits key, in standard base64 encoding
+  sessionCookieEncryptionKey:
   ssoDomain:
   ssoDefaultRedirectURL:
   sessionMaxLifetime: 10h