diff --git a/doc/DISCLAIMER.md b/doc/DISCLAIMER.md
index 1ed72030..bcee482a 100644
--- a/doc/DISCLAIMER.md
+++ b/doc/DISCLAIMER.md
@@ -121,7 +121,7 @@ Actually there are no functions in the client interface to set a user as admin.
 
 The following command will grant admin privilege to the specified user:
 ```
-su --command="psql matrix_synapse" postgres <<< "UPDATE users SET admin = 1 WHERE name = '@user_to_be_admin:domain.tld'"
+sudo su --command="psql matrix_synapse" postgres <<< "UPDATE users SET admin = 1 WHERE name = '@user_to_be_admin:domain.tld'"
 ```
 
 ### Administration API