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diff --git a/src/include/catalog/pg_amproc.h b/src/include/catalog/pg_amproc.h
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+/*-------------------------------------------------------------------------
+ *
+ * pg_amproc.h
+ *	  definition of the "access method procedure" system catalog (pg_amproc)
+ *
+ * The amproc table identifies support procedures associated with index
+ * operator families and classes.  These procedures can't be listed in pg_amop
+ * since they are not the implementation of any indexable operator.
+ *
+ * The primary key for this table is <amprocfamily, amproclefttype,
+ * amprocrighttype, amprocnum>.  The "default" support functions for a
+ * particular opclass within the family are those with amproclefttype =
+ * amprocrighttype = opclass's opcintype.  These are the ones loaded into the
+ * relcache for an index and typically used for internal index operations.
+ * Other support functions are typically used to handle cross-type indexable
+ * operators with oprleft/oprright matching the entry's amproclefttype and
+ * amprocrighttype. The exact behavior depends on the index AM, however, and
+ * some don't pay attention to non-default functions at all.
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/catalog/pg_amproc.h
+ *
+ * NOTES
+ *	  The Catalog.pm module reads this file and derives schema
+ *	  information.
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_AMPROC_H
+#define PG_AMPROC_H
+
+#include "catalog/genbki.h"
+#include "catalog/pg_amproc_d.h"
+
+/* ----------------
+ *		pg_amproc definition.  cpp turns this into
+ *		typedef struct FormData_pg_amproc
+ * ----------------
+ */
+CATALOG(pg_amproc,2603,AccessMethodProcedureRelationId)
+{
+	Oid			oid;			/* oid */
+
+	/* the index opfamily this entry is for */
+	Oid			amprocfamily BKI_LOOKUP(pg_opfamily);
+
+	/* procedure's left input data type */
+	Oid			amproclefttype BKI_LOOKUP(pg_type);
+
+	/* procedure's right input data type */
+	Oid			amprocrighttype BKI_LOOKUP(pg_type);
+
+	/* support procedure index */
+	int16		amprocnum;
+
+	/* OID of the proc */
+	regproc		amproc BKI_LOOKUP(pg_proc);
+} FormData_pg_amproc;
+
+/* ----------------
+ *		Form_pg_amproc corresponds to a pointer to a tuple with
+ *		the format of pg_amproc relation.
+ * ----------------
+ */
+typedef FormData_pg_amproc *Form_pg_amproc;
+
+#endif							/* PG_AMPROC_H */