diff --git a/REFERENCE.md b/REFERENCE.md
index 0902d2e5..6a9f2943 100644
--- a/REFERENCE.md
+++ b/REFERENCE.md
@@ -2013,6 +2013,7 @@ The following parameters are available in the `redis::instance` defined type:
* [`acls`](#-redis--instance--acls)
* [`output_buffer_limit_slave`](#-redis--instance--output_buffer_limit_slave)
* [`output_buffer_limit_pubsub`](#-redis--instance--output_buffer_limit_pubsub)
+* [`custom_options`](#-redis--instance--custom_options)
##### `activerehashing`
@@ -3025,6 +3026,14 @@ Value of client-output-buffer-limit-pubsub in redis config
Default value: `$redis::output_buffer_limit_pubsub`
+##### `custom_options`
+
+Data type: `Hash[String[1],Variant[String[1], Integer]]`
+
+hash of custom options, not available as direct parameter.
+
+Default value: `{}`
+
## Functions
### `redis::get`