diff --git a/sbin/camcontrol/fwdownload.c b/sbin/camcontrol/fwdownload.c
index 758efb78fd88..e59ae4c629db 100644
--- a/sbin/camcontrol/fwdownload.c
+++ b/sbin/camcontrol/fwdownload.c
@@ -25,6 +25,15 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+/*
+ * This software is derived from Andre Albsmeier's fwprog.c which contained
+ * the following note:
+ *
+ * Many thanks goes to Marc Frajola <marc@terasolutions.com> from
+ * TeraSolutions for the initial idea and his programme for upgrading
+ * the firmware of I*M DDYS drives.
+ */
+
 /*
  * BEWARE:
  *