diff --git a/src/include/optimizer/cost.h b/src/include/optimizer/cost.h
index 6141654e47..8e621d2f76 100644
--- a/src/include/optimizer/cost.h
+++ b/src/include/optimizer/cost.h
@@ -20,7 +20,7 @@
 
 /* defaults for costsize.c's Cost parameters */
 /* NB: cost-estimation code should use the variables, not these constants! */
-/* If you change these, update backend/utils/misc/postgresql.sample.conf */
+/* If you change these, update backend/utils/misc/postgresql.conf.sample */
 #define DEFAULT_SEQ_PAGE_COST  1.0
 #define DEFAULT_RANDOM_PAGE_COST  4.0
 #define DEFAULT_CPU_TUPLE_COST	0.01