diff --git a/website/docs/r/redis_instance.html.markdown b/website/docs/r/redis_instance.html.markdown
index 38dfaef4..c8210f8a 100644
--- a/website/docs/r/redis_instance.html.markdown
+++ b/website/docs/r/redis_instance.html.markdown
@@ -119,6 +119,8 @@ The following arguments are supported:
 * `redis_configs` -
   (Optional)
   Redis configuration parameters, according to http://redis.io/topics/config.
+  Currently, the only supported parameters are maxmemory-policy and notify-keyspace-events
+  (https://cloud.google.com/memorystore/docs/redis/reference/rest/v1/projects.locations.instances#Instance.FIELDS.redis_configs).
 
 * `location_id` -
   (Optional)