diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
index 8dff94fd50f..6de692c611b 100644
--- a/src/backend/utils/misc/postgresql.conf.sample
+++ b/src/backend/utils/misc/postgresql.conf.sample
@@ -306,7 +306,7 @@
 					#   fatal
 					#   panic (effectively off)
 
-#log_min_duration_statement = -1	# -1 is disabled, 0 logs all statements
+#log_min_duration_statement = -1ms	# -1 is disabled, 0 logs all statements
 					# and their durations, > 0 logs only
 					# statements running at least this time.