diff --git a/doc/src/sgml/pgbuffercache.sgml b/doc/src/sgml/pgbuffercache.sgml
index f379be225f..b261a4dbe0 100644
--- a/doc/src/sgml/pgbuffercache.sgml
+++ b/doc/src/sgml/pgbuffercache.sgml
@@ -82,7 +82,7 @@
smallint
Fork number within the relation; see
- include/storage/relfilenode.h>
+ include/common/relpath.h>