How to hide stored procedure's bodies from specific user

Hi

I want to hide my own stored procedures' bodies from the specific user.

As far as I know, procedure's body is visible in the pg_catalog.pg_proc table.

So, I did the following:

REVOKE ALL ON pg_catalog.pg_proc FROM PUBLIC;

And after it, when user tries:

SELECT * from pg_proc;

The following error occurs:

ERROR:  permission denied for relation pg_proc

It turns out that user don't have access to the body of the procedure.

But I still can get stored procedure's body using

\sf function_name 

or with 

\ef function_name

So, how can I completely hide my own stored procedure's bodies from this user?

Thanks in advance

Saimon