diff --git a/charts/argo-cd/README.md b/charts/argo-cd/README.md
index afc0e9bb..43388b1b 100644
--- a/charts/argo-cd/README.md
+++ b/charts/argo-cd/README.md
@@ -1392,6 +1392,7 @@ If you want to use an existing Redis (eg. a managed service from a cloud provide
 | externalRedis.port | int | `6379` | External Redis server port |
 | externalRedis.secretAnnotations | object | `{}` | External Redis Secret annotations |
 | externalRedis.username | string | `""` | External Redis username |
+| externalRedis.tls | bool | `false` | External Redis TLS |
 
 ### Redis secret-init