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diff --git a/include/git2/refdb.h b/include/git2/refdb.h
new file mode 100644
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--- /dev/null
+++ b/include/git2/refdb.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#ifndef INCLUDE_git_refdb_h__
+#define INCLUDE_git_refdb_h__
+
+#include "common.h"
+#include "types.h"
+#include "oid.h"
+#include "refs.h"
+
+/**
+ * @file git2/refdb.h
+ * @brief Git custom refs backend functions
+ * @defgroup git_refdb Git custom refs backend API
+ * @ingroup Git
+ * @{
+ */
+GIT_BEGIN_DECL
+
+/**
+ * Create a new reference.  Either an oid or a symbolic target must be
+ * specified.
+ *
+ * @param refdb the reference database to associate with this reference
+ * @param name the reference name
+ * @param oid the object id for a direct reference
+ * @param symbolic the target for a symbolic reference
+ * @return the created git_reference or NULL on error
+ */
+GIT_EXTERN(git_reference *) git_reference__alloc(
+	git_refdb *refdb,
+	const char *name,
+	const git_oid *oid,
+	const char *symbolic);
+
+/**
+ * Create a new reference database with no backends.
+ *
+ * Before the Ref DB can be used for read/writing, a custom database
+ * backend must be manually set using `git_refdb_set_backend()`
+ *
+ * @param out location to store the database pointer, if opened.
+ *			Set to NULL if the open failed.
+ * @param repo the repository
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_refdb_new(git_refdb **out, git_repository *repo);
+
+/**
+ * Create a new reference database and automatically add
+ * the default backends:
+ *
+ *  - git_refdb_dir: read and write loose and packed refs
+ *      from disk, assuming the repository dir as the folder
+ *
+ * @param out location to store the database pointer, if opened.
+ *			Set to NULL if the open failed.
+ * @param repo the repository
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_refdb_open(git_refdb **out, git_repository *repo);
+
+/**
+ * Suggests that the given refdb compress or optimize its references.
+ * This mechanism is implementation specific.  For on-disk reference
+ * databases, for example, this may pack all loose references.
+ */
+GIT_EXTERN(int) git_refdb_compress(git_refdb *refdb);
+
+/**
+ * Close an open reference database.
+ *
+ * @param refdb reference database pointer or NULL
+ */
+GIT_EXTERN(void) git_refdb_free(git_refdb *refdb);
+
+/**
+ * Sets the custom backend to an existing reference DB
+ *
+ * Read <refdb_backends.h> for more information.
+ *
+ * @param refdb database to add the backend to
+ * @param backend pointer to a git_refdb_backend instance
+ * @param priority Value for ordering the backends queue
+ * @return 0 on success; error code otherwise
+ */
+GIT_EXTERN(int) git_refdb_set_backend(
+	git_refdb *refdb,
+	git_refdb_backend *backend);
+
+/** @} */
+GIT_END_DECL
+
+#endif