diff --git a/docs/sysadm/data-silos/cassandra/installation.rst b/docs/sysadm/data-silos/cassandra/installation.rst
index 598e07ea1dc2bbc47bab1eb36274c6fe04e9c9ff..ccef8c2d57e5e84c7f553b72fa896d2c2cc5084a 100644
--- a/docs/sysadm/data-silos/cassandra/installation.rst
+++ b/docs/sysadm/data-silos/cassandra/installation.rst
@@ -128,6 +128,7 @@ Connect to cqlsh with the new `admin` user:
   GRANT ALTER ON ALL FUNCTIONS to 'swh-rw';
   GRANT SELECT ON KEYSPACE swh to 'swh-rw';
   GRANT MODIFY ON KEYSPACE swh to 'swh-rw';
+  GRANT EXECUTE ON ALL FUNCTIONS to 'swh-rw';
 
 6. Create the `swh-ro` user
 
@@ -135,6 +136,7 @@ Connect to cqlsh with the new `admin` user:
 
   CREATE ROLE 'swh-ro' WITH LOGIN = true AND PASSWORD = 'changeme';
   GRANT SELECT ON KEYSPACE swh to 'swh-ro';
+  GRANT EXECUTE ON ALL FUNCTIONS to 'swh-ro';
 
 7. Create the `reaper` user