diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
new file mode 100644
index 80e5aa1..a1d303b
*** a/src/backend/utils/misc/guc.c
--- b/src/backend/utils/misc/guc.c
*************** static struct config_int ConfigureNamesI
*** 2033,2039 ****
  		{"commit_delay", PGC_USERSET, WAL_SETTINGS,
  			gettext_noop("Sets the delay in microseconds between transaction commit and "
  						 "flushing WAL to disk."),
! 			NULL
  		},
  		&CommitDelay,
  		0, 0, 100000,
--- 2033,2040 ----
  		{"commit_delay", PGC_USERSET, WAL_SETTINGS,
  			gettext_noop("Sets the delay in microseconds between transaction commit and "
  						 "flushing WAL to disk."),
! 			NULL,
! 			GUC_UNIT_MS
  		},
  		&CommitDelay,
  		0, 0, 100000,
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
new file mode 100644
index c24afb0..adcbcf6
*** a/src/backend/utils/misc/postgresql.conf.sample
--- b/src/backend/utils/misc/postgresql.conf.sample
***************
*** 137,143 ****
  
  # - Cost-Based Vacuum Delay -
  
! #vacuum_cost_delay = 0ms		# 0-100 milliseconds
  #vacuum_cost_page_hit = 1		# 0-10000 credits
  #vacuum_cost_page_miss = 10		# 0-10000 credits
  #vacuum_cost_page_dirty = 20		# 0-10000 credits
--- 137,143 ----
  
  # - Cost-Based Vacuum Delay -
  
! #vacuum_cost_delay = 0			# 0-100 milliseconds
  #vacuum_cost_page_hit = 1		# 0-10000 credits
  #vacuum_cost_page_miss = 10		# 0-10000 credits
  #vacuum_cost_page_dirty = 20		# 0-10000 credits