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