comment fix for CUSTOMPATH_* flags

 src/include/nodes/execnodes.h | 3 ++-
 src/include/nodes/plannodes.h | 3 ++-
 src/include/nodes/relation.h  | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index e7fd7bd..d983a92 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -1611,7 +1611,8 @@ struct CustomExecMethods;
 typedef struct CustomScanState
 {
 	ScanState	ss;
-	uint32		flags;			/* mask of CUSTOMPATH_* flags, see relation.h */
+	uint32		flags;			/* mask of CUSTOMPATH_* flags,
+								 * see nodes/extensible.h */
 	List	   *custom_ps;		/* list of child PlanState nodes, if any */
 	Size		pscan_len;		/* size of parallel coordination information */
 	const struct CustomExecMethods *methods;
diff --git a/src/include/nodes/plannodes.h b/src/include/nodes/plannodes.h
index bc5463b..c84222c 100644
--- a/src/include/nodes/plannodes.h
+++ b/src/include/nodes/plannodes.h
@@ -560,7 +560,8 @@ struct CustomScanMethods;
 typedef struct CustomScan
 {
 	Scan		scan;
-	uint32		flags;			/* mask of CUSTOMPATH_* flags, see relation.h */
+	uint32		flags;			/* mask of CUSTOMPATH_* flags,
+								 * see nodes/extensible.h */
 	List	   *custom_plans;	/* list of Plan nodes, if any */
 	List	   *custom_exprs;	/* expressions that custom code may evaluate */
 	List	   *custom_private; /* private data for custom code */
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h
index fcfb0d4..a8f27f4 100644
--- a/src/include/nodes/relation.h
+++ b/src/include/nodes/relation.h
@@ -1087,7 +1087,8 @@ struct CustomPathMethods;
 typedef struct CustomPath
 {
 	Path		path;
-	uint32		flags;			/* mask of CUSTOMPATH_* flags, see above */
+	uint32		flags;			/* mask of CUSTOMPATH_* flags,
+								 * see nodes/extensible.h */
 	List	   *custom_paths;	/* list of child Path nodes, if any */
 	List	   *custom_private;
 	const struct CustomPathMethods *methods;