diff --git a/examples/icestick/icestick.pcf b/examples/icestick/icestick.pcf
index 49cb382..23067be 100644
--- a/examples/icestick/icestick.pcf
+++ b/examples/icestick/icestick.pcf
@@ -1,3 +1,6 @@
+# full iCEstick pinout:
+# http://www.pighixxx.com/test/portfolio-items/icestick/
+
 set_io --warn-no-port RX 9
 set_io --warn-no-port TX 8
 set_io LED1 99