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diff --git a/src/libcharon/plugins/certexpire/certexpire_cron.h b/src/libcharon/plugins/certexpire/certexpire_cron.h
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+/*
+ * Copyright (C) 2011 Martin Willi
+ * Copyright (C) 2011 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program 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.
+ */
+
+/**
+ * @defgroup certexpire_cron certexpire_cron
+ * @{ @ingroup certexpire
+ */
+
+#ifndef CERTEXPIRE_CRON_H_
+#define CERTEXPIRE_CRON_H_
+
+typedef struct certexpire_cron_t certexpire_cron_t;
+
+/**
+ * Callback function invoked by cron.
+ *
+ * @param data		user specified callback data
+ */
+typedef void (*certexpire_cron_job_t)(void *data);
+
+/**
+ * Cron style job scheduling.
+ */
+struct certexpire_cron_t {
+
+	/**
+	 * Destroy a certexpire_cron_t.
+	 *
+	 * It currently is not possible to savely cancel a cron job. Make sure
+	 * any scheduled jobs have been canceled before cleaning up.
+	 */
+	void (*destroy)(certexpire_cron_t *this);
+};
+
+/**
+ * Create a certexpire_cron instance.
+ *
+ * The cron string takes numeric arguments only, but supports ranges (1-5)
+ * and selections (1,3,5), or a combination, space separated:
+ *  minute hour day month weekday
+ *   minute, 0-59
+ *   hour, 0-23
+ *   day, 1-31
+ *   month, 1-12
+ *   weekday, 0-7 (0 == 7 == sunday)
+ * man crontab(5) for details.
+ *
+ * @param cron		cron style scheduling string
+ * @param job		callback function to invoke
+ * @param data		user data to pass to job
+ */
+certexpire_cron_t *certexpire_cron_create(char *cron, certexpire_cron_job_t job,
+										  void *data);
+
+#endif /** CERTEXPIRE_CRON_H_ @}*/