diff --git a/cassandra/values.yaml b/cassandra/values.yaml
index 331c29a..d0c466a 100644
--- a/cassandra/values.yaml
+++ b/cassandra/values.yaml
@@ -208,7 +208,8 @@ args: []
 ##  - name: FOO
 ##    value: BAR
 ##
-extraEnvVars: []
+extraEnvVars:
+  - name: CASSANDRA_CFG_YAML_SASI_INDEXES_ENABLED
 
 ## @param extraEnvVarsCM Name of existing ConfigMap containing extra env vars
 ##