diff --git a/src/backend/bootstrap/bootstrap.c b/src/backend/bootstrap/bootstrap.c
index 997e59ba95..eacb0129f6 100644
--- a/src/backend/bootstrap/bootstrap.c
+++ b/src/backend/bootstrap/bootstrap.c
@@ -7,7 +7,7 @@
  * Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/bootstrap/bootstrap.c,v 1.55 1999/02/13 23:14:52 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/bootstrap/bootstrap.c,v 1.56 1999/03/17 22:52:45 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -182,7 +182,7 @@ static char *relname;			/* current relation name */
 Form_pg_attribute attrtypes[MAXATTR];	/* points to attribute info */
 static char *values[MAXATTR];	/* cooresponding attribute values */
 int			numattr;			/* number of attributes for cur. rel */
-extern int	fsyncOff;			/* do not fsync the database */
+extern bool	disableFsync;			/* do not fsync the database */
 
 /* The test for HAVE_SIGSETJMP fails on Linux 2.0.x because the test
  *	explicitly disallows sigsetjmp being a #define, which is how it
@@ -335,7 +335,7 @@ BootstrapMain(int argc, char *argv[])
 				Noversion = true;
 				break;
 			case 'F':
-				fsyncOff = true;
+				disableFsync = true;
 				break;
 			case 'O':
 				override = true;
diff --git a/src/backend/catalog/aclchk.c b/src/backend/catalog/aclchk.c
index 601d0b83cb..92dfc98ff2 100644
--- a/src/backend/catalog/aclchk.c
+++ b/src/backend/catalog/aclchk.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/catalog/aclchk.c,v 1.19 1999/02/13 23:14:54 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/catalog/aclchk.c,v 1.20 1999/03/17 22:52:47 momjian Exp $
  *
  * NOTES
  *	  See acl.h.
@@ -38,6 +38,7 @@
 #include "utils/memutils.h"
 #include "utils/syscache.h"
 #include "utils/tqual.h"
+#include "miscadmin.h"
 
 static int32 aclcheck(char *relname, Acl *acl, AclId id, AclIdType idtype, AclMode mode);
 
@@ -398,7 +399,7 @@ pg_aclcheck(char *relname, char *usename, AclMode mode)
 	 * themselves from themselves.)
 	 */
 	if (((mode & ACL_WR) || (mode & ACL_AP)) &&
-		IsSystemRelationName(relname) &&
+		!allowSystemTableMods && IsSystemRelationName(relname) &&
 		!((Form_pg_shadow) GETSTRUCT(tuple))->usecatupd)
 	{
 		elog(DEBUG, "pg_aclcheck: catalog update to \"%s\": permission denied",
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 465fcf2f6a..53039f031a 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/catalog/heap.c,v 1.75 1999/02/23 07:54:03 thomas Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/catalog/heap.c,v 1.76 1999/03/17 22:52:48 momjian Exp $
  *
  *
  * INTERFACE ROUTINES
@@ -195,7 +195,7 @@ heap_create(char *relname,
 	 */
 	AssertArg(natts > 0);
 
-	if (relname && IsSystemRelationName(relname) && IsNormalProcessingMode())
+	if (relname && !allowSystemTableMods && IsSystemRelationName(relname) && IsNormalProcessingMode())
 	{
 		elog(ERROR, "Illegal class name '%s'"
 			 "\n\tThe 'pg_' name prefix is reserved for system catalogs",
@@ -1260,7 +1260,8 @@ heap_destroy_with_catalog(char *relname)
 	 * ----------------
 	 */
 	/* allow temp of pg_class? Guess so. */
-	if (!istemp && IsSystemRelationName(RelationGetRelationName(rel)->data))
+	if (!istemp &&
+		!allowSystemTableMods && IsSystemRelationName(RelationGetRelationName(rel)->data))
 		elog(ERROR, "System relation '%s' cannot be destroyed",
 			 &rel->rd_rel->relname);
 
diff --git a/src/backend/commands/command.c b/src/backend/commands/command.c
index ca5cbeff9e..4a391cd549 100644
--- a/src/backend/commands/command.c
+++ b/src/backend/commands/command.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/commands/Attic/command.c,v 1.39 1999/02/24 17:28:57 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/commands/Attic/command.c,v 1.40 1999/03/17 22:52:51 momjian Exp $
  *
  * NOTES
  *	  The PortalExecutorHeapMemory crap needs to be eliminated
@@ -308,7 +308,7 @@ PerformAddAttribute(char *relationName,
 	 *
 	 * normally, only the owner of a class can change its schema.
 	 */
-	if (IsSystemRelationName(relationName))
+	if (!allowSystemTableMods && IsSystemRelationName(relationName))
 		elog(ERROR, "PerformAddAttribute: class \"%s\" is a system catalog",
 			 relationName);
 #ifndef NO_SECURITY
diff --git a/src/backend/commands/rename.c b/src/backend/commands/rename.c
index 103350c796..116d515bd4 100644
--- a/src/backend/commands/rename.c
+++ b/src/backend/commands/rename.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/commands/Attic/rename.c,v 1.21 1999/02/13 23:15:09 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/commands/Attic/rename.c,v 1.22 1999/03/17 22:52:52 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -81,7 +81,7 @@ renameatt(char *relname,
 	 *
 	 * normally, only the owner of a class can change its schema.
 	 */
-	if (IsSystemRelationName(relname))
+	if (!allowSystemTableMods && IsSystemRelationName(relname))
 		elog(ERROR, "renameatt: class \"%s\" is a system catalog",
 			 relname);
 #ifndef NO_SECURITY
@@ -207,11 +207,11 @@ renamerel(char *oldrelname, char *newrelname)
 				newpath[MAXPGPATH];
 	Relation	irelations[Num_pg_class_indices];
 
-	if (IsSystemRelationName(oldrelname))
+	if (!allowSystemTableMods && IsSystemRelationName(oldrelname))
 		elog(ERROR, "renamerel: system relation \"%s\" not renamed",
 			 oldrelname);
 
-	if (IsSystemRelationName(newrelname))
+	if (!allowSystemTableMods && IsSystemRelationName(newrelname))
 		elog(ERROR, "renamerel: Illegal class name: \"%s\" -- pg_ is reserved for system catalogs",
 			 newrelname);
 
diff --git a/src/backend/commands/trigger.c b/src/backend/commands/trigger.c
index 1a06065da0..7299a7660a 100644
--- a/src/backend/commands/trigger.c
+++ b/src/backend/commands/trigger.c
@@ -66,7 +66,7 @@ CreateTrigger(CreateTrigStmt *stmt)
 	int			found = 0;
 	int			i;
 
-	if (IsSystemRelationName(stmt->relname))
+	if (!allowSystemTableMods && IsSystemRelationName(stmt->relname))
 		elog(ERROR, "CreateTrigger: can't create trigger for system relation %s", stmt->relname);
 
 #ifndef NO_SECURITY
diff --git a/src/backend/parser/gram.c b/src/backend/parser/gram.c
index 6378c01572..86a3fb5d57 100644
--- a/src/backend/parser/gram.c
+++ b/src/backend/parser/gram.c
@@ -242,7 +242,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/Attic/gram.c,v 2.81 1999/03/17 21:02:50 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/Attic/gram.c,v 2.82 1999/03/17 22:52:57 momjian Exp $
  *
  * HISTORY
  *	  AUTHOR			DATE			MAJOR EVENT
diff --git a/src/backend/storage/file/fd.c b/src/backend/storage/file/fd.c
index 0cf8478959..3948a89850 100644
--- a/src/backend/storage/file/fd.c
+++ b/src/backend/storage/file/fd.c
@@ -6,7 +6,7 @@
  * Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $Id: fd.c,v 1.37 1999/02/13 23:18:05 momjian Exp $
+ *	  $Id: fd.c,v 1.38 1999/03/17 22:53:06 momjian Exp $
  *
  * NOTES:
  *
@@ -168,9 +168,7 @@ static long pg_nofile(void);
 int
 pg_fsync(int fd)
 {
-	extern int	fsyncOff;
-
-	return fsyncOff ? 0 : fsync(fd);
+	return disableFsync ? 0 : fsync(fd);
 }
 
 #define fsync pg_fsync
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 8185b77f5d..9e4a4efa4e 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.104 1999/02/21 03:49:27 scrappy Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.105 1999/03/17 22:53:18 momjian Exp $
  *
  * NOTES
  *	  this is the "main" module of the postgres backend and
@@ -917,6 +917,7 @@ usage(char *progname)
 #ifdef LOCK_MGR_DEBUG
 	fprintf(stderr, "\t-K \t\tset locking debug level [0|1|2]\n");
 #endif
+	fprintf(stderr, "\t-O \t\tallow system table structure changes\n");
 	fprintf(stderr, "\t-P port\t\tset port file descriptor\n");
 	fprintf(stderr, "\t-Q \t\tsuppress informational messages\n");
 	fprintf(stderr, "\t-S buffers\tset amount of sort memory available\n");
@@ -1017,7 +1018,7 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
 	optind = 1;					/* reset after postmaster usage */
 
 	while ((flag = getopt(argc, argv,
-						  "A:B:CD:d:Eef:iK:Lm:MNo:P:pQS:st:v:x:FW:"))
+						  "A:B:CD:d:Eef:iK:Lm:MNOo:P:pQS:st:v:x:FW:"))
 		   != EOF)
 		switch (flag)
 		{
@@ -1096,7 +1097,7 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
 				 *	turn off fsync
 				 * --------------------
 				 */
-				fsyncOff = 1;
+				disableFsync = true;
 				break;
 
 			case 'f':
@@ -1168,6 +1169,14 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
 				StrNCpy(OutputFileName, optarg, MAXPGPATH);
 				break;
 
+			case 'O':
+				/* --------------------
+				 *	allow system table structure modifications
+				 * --------------------
+				 */
+				allowSystemTableMods = true;
+				break;
+
 			case 'p':			/* started by postmaster */
 				/* ----------------
 				 *	p - special flag passed if backend was forked
@@ -1522,7 +1531,7 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
 	if (!IsUnderPostmaster)
 	{
 		puts("\nPOSTGRES backend interactive interface ");
-		puts("$Revision: 1.104 $ $Date: 1999/02/21 03:49:27 $\n");
+		puts("$Revision: 1.105 $ $Date: 1999/03/17 22:53:18 $\n");
 	}
 
 	/* ----------------
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 4e90663228..0df4bf2641 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.58 1999/03/16 03:24:17 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.59 1999/03/17 22:53:19 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -187,7 +187,7 @@ ProcessUtility(Node *parsetree,
 				foreach(arg, args)
 				{
 					relname = strVal(lfirst(arg));
-					if (IsSystemRelationName(relname))
+					if (!allowSystemTableMods && IsSystemRelationName(relname))
 						elog(ERROR, "class \"%s\" is a system catalog",
 							 relname);
 					rel = heap_openr(relname);
@@ -268,7 +268,7 @@ ProcessUtility(Node *parsetree,
 				CHECK_IF_ABORTED();
 
 				relname = stmt->relname;
-				if (IsSystemRelationName(relname))
+				if (!allowSystemTableMods && IsSystemRelationName(relname))
 					elog(ERROR, "class \"%s\" is a system catalog",
 						 relname);
 #ifndef NO_SECURITY
@@ -457,7 +457,7 @@ ProcessUtility(Node *parsetree,
 				{
 					case INDEX:
 						relname = stmt->name;
-						if (IsSystemRelationName(relname))
+						if (!allowSystemTableMods && IsSystemRelationName(relname))
 							elog(ERROR, "class \"%s\" is a system catalog index",
 								 relname);
 #ifndef NO_SECURITY
diff --git a/src/backend/utils/init/globals.c b/src/backend/utils/init/globals.c
index 23d63748cf..344193ab52 100644
--- a/src/backend/utils/init/globals.c
+++ b/src/backend/utils/init/globals.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/init/globals.c,v 1.27 1999/02/13 23:20:00 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/init/globals.c,v 1.28 1999/03/17 22:53:19 momjian Exp $
  *
  * NOTES
  *	  Globals used all over the place should be declared here and not
@@ -82,7 +82,8 @@ char		DateFormat[20] = "%d-%m-%Y";		/* mjl: sizes! or better
 												 * malloc? XXX */
 char		FloatFormat[20] = "%f";
 
-int			fsyncOff = 0;
+bool		disableFsync = false;
+bool		allowSystemTableMods = false;
 int			SortMem = 512;
 
 char	   *IndexedCatalogNames[] = {
diff --git a/src/bin/initdb/initdb.sh b/src/bin/initdb/initdb.sh
index 56feebfc8d..76ddb6468b 100644
--- a/src/bin/initdb/initdb.sh
+++ b/src/bin/initdb/initdb.sh
@@ -26,7 +26,7 @@
 #
 #
 # IDENTIFICATION
-#    $Header: /cvsroot/pgsql/src/bin/initdb/Attic/initdb.sh,v 1.57 1999/01/28 15:28:40 wieck Exp $
+#    $Header: /cvsroot/pgsql/src/bin/initdb/Attic/initdb.sh,v 1.58 1999/03/17 22:53:25 momjian Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -398,7 +398,7 @@ fi
 
 echo
 
-PGSQL_OPT="-o /dev/null -F -Q -D$PGDATA"
+PGSQL_OPT="-o /dev/null -O -F -Q -D$PGDATA"
 
 # If the COPY is first, the VACUUM generates an error, so we vacuum first
 echo "Vacuuming template1"
@@ -408,7 +408,7 @@ echo "COPY pg_shadow TO '$PGDATA/pg_pwd' USING DELIMITERS '\\t'" | \
 	postgres $PGSQL_OPT template1 > /dev/null
 
 echo "Creating public pg_user view"
-echo "CREATE TABLE xpg_user (		\
+echo "CREATE TABLE pg_user (		\
 	    usename	name,		\
 	    usesysid	int4,		\
 	    usecreatedb	bool,		\
@@ -418,12 +418,6 @@ echo "CREATE TABLE xpg_user (		\
 	    passwd		text,		\
 	    valuntil	abstime);" | postgres $PGSQL_OPT template1 > /dev/null
 
-#move it into pg_user
-echo "UPDATE pg_class SET relname = 'pg_user' WHERE relname = 'xpg_user';" |\
-	postgres $PGSQL_OPT template1 > /dev/null
-echo "UPDATE pg_type SET typname = 'pg_user' WHERE typname = 'xpg_user';" |\
-	postgres $PGSQL_OPT template1 > /dev/null
-mv $PGDATA/base/template1/xpg_user $PGDATA/base/template1/pg_user
 
 echo "CREATE RULE \"_RETpg_user\" AS ON SELECT TO pg_user DO INSTEAD	\
 	    SELECT usename, usesysid, usecreatedb, usetrace,		\
@@ -434,16 +428,10 @@ echo "REVOKE ALL on pg_shadow FROM public" | \
 	postgres $PGSQL_OPT template1 > /dev/null
 
 echo "Creating view pg_rules"
-echo "CREATE TABLE xpg_rules (		\
+echo "CREATE TABLE pg_rules (		\
 	    tablename	name,		\
 	    rulename	name,		\
 	    definition	text);" | postgres $PGSQL_OPT template1 > /dev/null
-#move it into pg_rules
-echo "UPDATE pg_class SET relname = 'pg_rules' WHERE relname = 'xpg_rules';" |\
-	postgres $PGSQL_OPT template1 > /dev/null
-echo "UPDATE pg_type SET typname = 'pg_rules' WHERE typname = 'xpg_rules';" |\
-	postgres $PGSQL_OPT template1 > /dev/null
-mv $PGDATA/base/template1/xpg_rules $PGDATA/base/template1/pg_rules
 
 echo "CREATE RULE \"_RETpg_rules\" AS ON SELECT TO pg_rules DO INSTEAD	\
 	    SELECT C.relname AS tablename,				\
@@ -455,16 +443,10 @@ echo "CREATE RULE \"_RETpg_rules\" AS ON SELECT TO pg_rules DO INSTEAD	\
 	postgres $PGSQL_OPT template1 > /dev/null
 
 echo "Creating view pg_views"
-echo "CREATE TABLE xpg_views (		\
+echo "CREATE TABLE pg_views (		\
 	    viewname	name,		\
 	    viewowner	name,		\
 	    definition	text);" | postgres $PGSQL_OPT template1 > /dev/null
-#move it into pg_views
-echo "UPDATE pg_class SET relname = 'pg_views' WHERE relname = 'xpg_views';" |\
-	postgres $PGSQL_OPT template1 > /dev/null
-echo "UPDATE pg_type SET typname = 'pg_views' WHERE typname = 'xpg_views';" |\
-	postgres $PGSQL_OPT template1 > /dev/null
-mv $PGDATA/base/template1/xpg_views $PGDATA/base/template1/pg_views
 
 echo "CREATE RULE \"_RETpg_views\" AS ON SELECT TO pg_views DO INSTEAD	\
 	    SELECT C.relname AS viewname, 				\
@@ -476,18 +458,12 @@ echo "CREATE RULE \"_RETpg_views\" AS ON SELECT TO pg_views DO INSTEAD	\
 	postgres $PGSQL_OPT template1 > /dev/null
 
 echo "Creating view pg_tables"
-echo "CREATE TABLE xpg_tables (		\
+echo "CREATE TABLE pg_tables (		\
 	    tablename	name,		\
 	    tableowner	name,		\
 	    hasindexes	bool,		\
 	    hasrules	bool,		\
 	    hastriggers	bool);" | postgres $PGSQL_OPT template1 > /dev/null
-#move it into pg_tables
-echo "UPDATE pg_class SET relname = 'pg_tables' WHERE relname = 'xpg_tables';" |\
-	postgres $PGSQL_OPT template1 > /dev/null
-echo "UPDATE pg_type SET typname = 'pg_tables' WHERE typname = 'xpg_tables';" |\
-	postgres $PGSQL_OPT template1 > /dev/null
-mv $PGDATA/base/template1/xpg_tables $PGDATA/base/template1/pg_tables
 
 echo "CREATE RULE \"_RETpg_tables\" AS ON SELECT TO pg_tables DO INSTEAD	\
 	    SELECT C.relname AS tablename, 				\
@@ -501,16 +477,10 @@ echo "CREATE RULE \"_RETpg_tables\" AS ON SELECT TO pg_tables DO INSTEAD	\
 	postgres $PGSQL_OPT template1 > /dev/null
 
 echo "Creating view pg_indexes"
-echo "CREATE TABLE xpg_indexes (	\
+echo "CREATE TABLE pg_indexes (	\
 	    tablename	name,		\
 	    indexname	name,		\
 	    indexdef	text);" | postgres $PGSQL_OPT template1 > /dev/null
-#move it into pg_indexes
-echo "UPDATE pg_class SET relname = 'pg_indexes' WHERE relname = 'xpg_indexes';" |\
-	postgres $PGSQL_OPT template1 > /dev/null
-echo "UPDATE pg_type SET typname = 'pg_indexes' WHERE typname = 'xpg_indexes';" |\
-	postgres $PGSQL_OPT template1 > /dev/null
-mv $PGDATA/base/template1/xpg_indexes $PGDATA/base/template1/pg_indexes
 
 echo "CREATE RULE \"_RETpg_indexes\" AS ON SELECT TO pg_indexes DO INSTEAD	\
 	    SELECT C.relname AS tablename, 				\
@@ -528,4 +498,3 @@ echo "copy pg_description from '$GLOBAL_DESCR'" | \
 	postgres $PGSQL_OPT template1 > /dev/null
 echo "vacuum analyze" | \
 	postgres $PGSQL_OPT template1 > /dev/null
-
diff --git a/src/include/miscadmin.h b/src/include/miscadmin.h
index 01ceb9d787..fa5397f070 100644
--- a/src/include/miscadmin.h
+++ b/src/include/miscadmin.h
@@ -11,7 +11,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: miscadmin.h,v 1.35 1999/02/13 23:20:46 momjian Exp $
+ * $Id: miscadmin.h,v 1.36 1999/03/17 22:53:30 momjian Exp $
  *
  * NOTES
  *	  some of the information in this file will be moved to
@@ -94,7 +94,8 @@ extern char CTZName[];
 extern char FloatFormat[];
 extern char DateFormat[];
 
-extern int	fsyncOff;
+extern bool	disableFsync;
+extern bool	allowSystemTableMods;
 extern int	SortMem;
 
 extern Oid	LastOidProcessed;	/* for query rewrite */
diff --git a/src/man/postgres.1 b/src/man/postgres.1
index ef9b72af31..a8a971aae0 100644
--- a/src/man/postgres.1
+++ b/src/man/postgres.1
@@ -1,6 +1,6 @@
 .\" This is -*-nroff-*-
 .\" XXX standard disclaimer belongs here....
-.\" $Header: /cvsroot/pgsql/src/man/Attic/postgres.1,v 1.13 1999/02/18 05:26:34 momjian Exp $
+.\" $Header: /cvsroot/pgsql/src/man/Attic/postgres.1,v 1.14 1999/03/17 22:53:31 momjian Exp $
 .TH POSTGRESQL UNIX 12/08/96 PostgreSQL PostgreSQL
 .SH NAME
 postgres - the Postgres backend server
@@ -22,6 +22,9 @@ data_directory]
 .BR "-F"
 ]
 [\c
+.BR "-O"
+]
+[\c
 .BR "-P"
 filedes]
 [\c
@@ -99,6 +102,9 @@ Disable automatic fsync() call after each transaction.
 This option improves performance, but an operating system crash
 while a transaction is in progress will probably cause data loss.
 .TP
+.BR "-O"
+Override restrictions, so system table structures can be modified(pg_*).
+.TP
 .BR "-P" " filedes"
 .IR "filedes"
 specifies the file descriptor that corresponds to the socket (port) on