diff --git a/include/types/checks.h b/include/types/checks.h
new file mode 100644
index 0000000..87ff2c8
--- /dev/null
+++ b/include/types/checks.h
@@ -0,0 +1,41 @@
+/*
+ * Health-checks.
+ *
+ * Copyright 2008-2009 Krzysztof Piotr Oledzki <ole@ans.pl>
+ *
+ * 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.
+ *
+ */
+
+/* check status */
+enum {
+	HCHK_STATUS_UNKNOWN	 = 0,	/* Unknown */
+	HCHK_STATUS_INI,		/* Initializing */
+
+	/* Below we have check finished */
+	HCHK_STATUS_CHECKED,		/* DUMMY STATUS */
+	HCHK_STATUS_SOCKERR,		/* Socket error */
+
+	HCHK_STATUS_L4OK,		/* L4 check passed, for example tcp connect */
+	HCHK_STATUS_L4TOUT,		/* L4 timeout */
+	HCHK_STATUS_L4CON,		/* L4 connection problem, for example: */
+					/*  "Connection refused" (tcp rst) or "No route to host" (icmp) */
+
+	HCHK_STATUS_L6OK,		/* L6 check passed */
+	HCHK_STATUS_L6TOUT,		/* L6 (SSL) timeout */
+	HCHK_STATUS_L6RSP,		/* L6 invalid response - protocol error */
+
+	HCHK_STATUS_L7TOUT,		/* L7 (HTTP/SMTP) timeout */
+	HCHK_STATUS_L7RSP,		/* L7 invalid response - protocol error */
+
+	/* Below we have layer 5-7 data avaliable */
+	HCHK_STATUS_L57DATA,		/* DUMMY STATUS */
+	HCHK_STATUS_L7OKD,		/* L7 check passed */
+	HCHK_STATUS_L7OKCD,		/* L7 check conditionally passed */
+	HCHK_STATUS_L7STS,		/* L7 response error, for example HTTP 5xx */
+
+	HCHK_STATUS_SIZE
+};