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diff --git a/src/include/catalog/pg_opclass.h b/src/include/catalog/pg_opclass.h
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+/*-------------------------------------------------------------------------
+ *
+ * pg_opclass.h
+ *	  definition of the "operator class" system catalog (pg_opclass)
+ *
+ * The primary key for this table is <opcmethod, opcname, opcnamespace> ---
+ * that is, there is a row for each valid combination of opclass name and
+ * index access method type.  This row specifies the expected input data type
+ * for the opclass (the type of the heap column, or the expression output type
+ * in the case of an index expression).  Note that types binary-coercible to
+ * the specified type will be accepted too.
+ *
+ * For a given <opcmethod, opcintype> pair, there can be at most one row that
+ * has opcdefault = true; this row is the default opclass for such data in
+ * such an index.  (This is not currently enforced by an index, because we
+ * don't support partial indexes on system catalogs.)
+ *
+ * Normally opckeytype = InvalidOid (zero), indicating that the data stored
+ * in the index is the same as the data in the indexed column.  If opckeytype
+ * is nonzero then it indicates that a conversion step is needed to produce
+ * the stored index data, which will be of type opckeytype (which might be
+ * the same or different from the input datatype).  Performing such a
+ * conversion is the responsibility of the index access method --- not all
+ * AMs support this.
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/catalog/pg_opclass.h
+ *
+ * NOTES
+ *	  The Catalog.pm module reads this file and derives schema
+ *	  information.
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_OPCLASS_H
+#define PG_OPCLASS_H
+
+#include "catalog/genbki.h"
+#include "catalog/pg_opclass_d.h"
+
+/* ----------------
+ *		pg_opclass definition.  cpp turns this into
+ *		typedef struct FormData_pg_opclass
+ * ----------------
+ */
+CATALOG(pg_opclass,2616,OperatorClassRelationId)
+{
+	Oid			oid;			/* oid */
+
+	/* index access method opclass is for */
+	Oid			opcmethod BKI_LOOKUP(pg_am);
+
+	/* name of this opclass */
+	NameData	opcname;
+
+	/* namespace of this opclass */
+	Oid			opcnamespace BKI_DEFAULT(PGNSP);
+
+	/* opclass owner */
+	Oid			opcowner BKI_DEFAULT(PGUID);
+
+	/* containing operator family */
+	Oid			opcfamily BKI_LOOKUP(pg_opfamily);
+
+	/* type of data indexed by opclass */
+	Oid			opcintype BKI_LOOKUP(pg_type);
+
+	/* T if opclass is default for opcintype */
+	bool		opcdefault BKI_DEFAULT(t);
+
+	/* type of data in index, or InvalidOid */
+	Oid			opckeytype BKI_DEFAULT(0) BKI_LOOKUP(pg_type);
+} FormData_pg_opclass;
+
+/* ----------------
+ *		Form_pg_opclass corresponds to a pointer to a tuple with
+ *		the format of pg_opclass relation.
+ * ----------------
+ */
+typedef FormData_pg_opclass *Form_pg_opclass;
+
+#endif							/* PG_OPCLASS_H */