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diff --git a/include/git2/odb_backend.h b/include/git2/odb_backend.h
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+/*
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2,
+ * as published by the Free Software Foundation.
+ *
+ * In addition to the permissions in the GNU General Public License,
+ * the authors give you unlimited permission to link the compiled
+ * version of this file into combinations with other programs,
+ * and to distribute those combinations without any restriction
+ * coming from the use of this file.  (The General Public License
+ * restrictions do apply in other respects; for example, they cover
+ * modification of the file, and distribution when not linked into
+ * a combined executable.)
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+#ifndef INCLUDE_git_odb_backend_h__
+#define INCLUDE_git_odb_backend_h__
+
+#include "common.h"
+#include "types.h"
+#include "oid.h"
+#include "odb.h"
+
+/**
+ * @file git2/backend.h
+ * @brief Git custom backend functions
+ * @defgroup git_backend Git custom backend API
+ * @ingroup Git
+ * @{
+ */
+GIT_BEGIN_DECL
+
+/** An instance for a custom backend */
+struct git_odb_backend {
+	git_odb *odb;
+
+	int (* read)(
+			git_rawobj *,
+			struct git_odb_backend *,
+			const git_oid *);
+
+	int (* read_header)(
+			git_rawobj *,
+			struct git_odb_backend *,
+			const git_oid *);
+
+	int (* write)(
+			git_oid *id,
+			struct git_odb_backend *,
+			git_rawobj *obj);
+
+	int (* exists)(
+			struct git_odb_backend *,
+			const git_oid *);
+
+	void (* free)(struct git_odb_backend *);
+};
+
+GIT_EXTERN(int) git_odb_backend_pack(git_odb_backend **backend_out, const char *objects_dir);
+GIT_EXTERN(int) git_odb_backend_loose(git_odb_backend **backend_out, const char *objects_dir);
+
+#ifdef GIT2_SQLITE_BACKEND
+GIT_EXTERN(int) git_odb_backend_sqlite(git_odb_backend **backend_out, const char *sqlite_db);
+#endif
+
+GIT_END_DECL
+
+#endif