diff --git a/cronjob/checksensor/mailer.c b/cronjob/checksensor/mailer.c
index c40bcbf..09432ba 100644
--- a/cronjob/checksensor/mailer.c
+++ b/cronjob/checksensor/mailer.c
@@ -1,3 +1,31 @@
+/*
+   mailer.c      -- Wrapper for libesmtp
+
+   Copyright (C) 2006 Jan Losinski
+
+   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.
+
+   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.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+/* Compiling:
+ * it uses libesmtp and libssl, so you must add
+ * -lesmtp and -lssl for linking.
+ * Debug-output can be activated with -DDEBUG as 
+ * compile-option. */
+
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
diff --git a/cronjob/checksensor/mailer.h b/cronjob/checksensor/mailer.h
index 501ebe6..b9ef4ea 100644
--- a/cronjob/checksensor/mailer.h
+++ b/cronjob/checksensor/mailer.h
@@ -1,3 +1,31 @@
+/*
+   mailer.h      -- Wrapper for libesmtp
+
+   Copyright (C) 2006 Jan Losinski
+
+   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.
+
+   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.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+/* Compiling:
+ * it uses libesmtp and libssl, so you must add
+ * -lesmtp and -lssl for linking.
+ * Debug-output can be activated with -DDEBUG as 
+ * compile-option. */
+
+
 #include <auth-client.h>
 
 #define SSL_ENABLED   0