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diff --git a/src/include/storage/indexfsm.h b/src/include/storage/indexfsm.h
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+/*-------------------------------------------------------------------------
+ *
+ * indexfsm.h
+ *	  POSTGRES free space map for quickly finding an unused page in index
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/storage/indexfsm.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef INDEXFSM_H_
+#define INDEXFSM_H_
+
+#include "storage/block.h"
+#include "utils/relcache.h"
+
+extern BlockNumber GetFreeIndexPage(Relation rel);
+extern void RecordFreeIndexPage(Relation rel, BlockNumber page);
+extern void RecordUsedIndexPage(Relation rel, BlockNumber page);
+
+extern void IndexFreeSpaceMapVacuum(Relation rel);
+
+#endif							/* INDEXFSM_H_ */