*** a/src/bin/psql/command.c
--- b/src/bin/psql/command.c
***************
*** 410,416 **** exec_command(const char *cmd,
  				success = listSchemas(pattern, show_verbose, show_system);
  				break;
  			case 'o':
! 				success = describeOperators(pattern, show_system);
  				break;
  			case 'O':
  				success = listCollations(pattern, show_verbose, show_system);
--- 410,416 ----
  				success = listSchemas(pattern, show_verbose, show_system);
  				break;
  			case 'o':
! 				success = describeOperators(pattern, show_verbose, show_system);
  				break;
  			case 'O':
  				success = listCollations(pattern, show_verbose, show_system);
*** a/src/bin/psql/describe.c
--- b/src/bin/psql/describe.c
***************
*** 579,585 **** describeTypes(const char *pattern, bool verbose, bool showSystem)
  /* \do
   */
  bool
! describeOperators(const char *pattern, bool showSystem)
  {
  	PQExpBufferData buf;
  	PGresult   *res;
--- 579,585 ----
  /* \do
   */
  bool
! describeOperators(const char *pattern, bool verbose, bool showSystem)
  {
  	PQExpBufferData buf;
  	PGresult   *res;
***************
*** 605,615 **** describeOperators(const char *pattern, bool showSystem)
  					  "  o.oprname AS \"%s\",\n"
  					  "  CASE WHEN o.oprkind='l' THEN NULL ELSE pg_catalog.format_type(o.oprleft, NULL) END AS \"%s\",\n"
  					  "  CASE WHEN o.oprkind='r' THEN NULL ELSE pg_catalog.format_type(o.oprright, NULL) END AS \"%s\",\n"
! 				   "  pg_catalog.format_type(o.oprresult, NULL) AS \"%s\",\n"
! 			 "  coalesce(pg_catalog.obj_description(o.oid, 'pg_operator'),\n"
! 	"           pg_catalog.obj_description(o.oprcode, 'pg_proc')) AS \"%s\"\n"
! 					  "FROM pg_catalog.pg_operator o\n"
! 	  "     LEFT JOIN pg_catalog.pg_namespace n ON n.oid = o.oprnamespace\n",
  					  gettext_noop("Schema"),
  					  gettext_noop("Name"),
  					  gettext_noop("Left arg type"),
--- 605,613 ----
  					  "  o.oprname AS \"%s\",\n"
  					  "  CASE WHEN o.oprkind='l' THEN NULL ELSE pg_catalog.format_type(o.oprleft, NULL) END AS \"%s\",\n"
  					  "  CASE WHEN o.oprkind='r' THEN NULL ELSE pg_catalog.format_type(o.oprright, NULL) END AS \"%s\",\n"
! 					  "  pg_catalog.format_type(o.oprresult, NULL) AS \"%s\",\n"
! 					  "  coalesce(pg_catalog.obj_description(o.oid, 'pg_operator'),\n"
! 					  "           pg_catalog.obj_description(o.oprcode, 'pg_proc')) AS \"%s\"\n",
  					  gettext_noop("Schema"),
  					  gettext_noop("Name"),
  					  gettext_noop("Left arg type"),
***************
*** 617,622 **** describeOperators(const char *pattern, bool showSystem)
--- 615,641 ----
  					  gettext_noop("Result type"),
  					  gettext_noop("Description"));
  
+ 	if (verbose)
+ 		appendPQExpBuffer(&buf,
+ 						  ",\n  o.oprcode AS \"%s\",\n"
+ 						  "  CASE\n"
+ 						  "    WHEN p.provolatile = 'i' THEN '%s'\n"
+ 						  "    WHEN p.provolatile = 's' THEN '%s'\n"
+ 						  "    WHEN p.provolatile = 'v' THEN '%s'\n"
+ 						  "  END AS \"%s\"\n",
+ 						  gettext_noop("Function"),
+ 						  gettext_noop("immutable"),
+ 						  gettext_noop("stable"),
+ 						  gettext_noop("volatile"),
+ 						  gettext_noop("Volatility"));
+ 
+ 	appendPQExpBuffer(&buf,
+ 					  "FROM pg_catalog.pg_operator o\n"
+ 					  "     LEFT JOIN pg_catalog.pg_namespace n ON n.oid = o.oprnamespace\n");
+ 	if (verbose)
+ 		appendPQExpBuffer(&buf,
+ 						  "\n    LEFT JOIN pg_catalog.pg_proc p ON p.oid = o.oprcode\n");
+ 
  	if (!showSystem && !pattern)
  		appendPQExpBufferStr(&buf, "WHERE n.nspname <> 'pg_catalog'\n"
  							 "      AND n.nspname <> 'information_schema'\n");
*** a/src/bin/psql/describe.h
--- b/src/bin/psql/describe.h
***************
*** 22,28 **** extern bool describeFunctions(const char *functypes, const char *pattern, bool v
  extern bool describeTypes(const char *pattern, bool verbose, bool showSystem);
  
  /* \do */
! extern bool describeOperators(const char *pattern, bool showSystem);
  
  /* \du, \dg */
  extern bool describeRoles(const char *pattern, bool verbose);
--- 22,28 ----
  extern bool describeTypes(const char *pattern, bool verbose, bool showSystem);
  
  /* \do */
! extern bool describeOperators(const char *pattern, bool verbose, bool showSystem);
  
  /* \du, \dg */
  extern bool describeRoles(const char *pattern, bool verbose);