README.md in seo_cache-1.2.2 vs README.md in seo_cache-1.3.0

@@ -84,13 +84,19 @@
 
 ```ruby
 SeoCache.redis_url = "redis://localhost:6379/"
 ```
 
-Redis prefix:
+Redis prefix (if needed):
 
 ```ruby
 SeoCache.redis_namespace = '_my_project:seo_cache'
+```
+
+Redis database index (if needed):
+
+```ruby
+SeoCache.redis_db_index = 1
 ```
 
 Waiting time before the page is fully loaded (optional in sec, useful for async elements):
     
 ```ruby