diff --git a/CosmicPiV2_DUE_test_script.ino b/CosmicPiV1_single_chaneel.ino
similarity index 97%
rename from CosmicPiV2_DUE_test_script.ino
rename to CosmicPiV1_single_chaneel.ino
index c512be3..69ea104 100644
--- a/CosmicPiV2_DUE_test_script.ino
+++ b/CosmicPiV1_single_chaneel.ino
@@ -1,3 +1,10 @@
+/*work in progress - single channel mode for V1 cosmic Pi hardware.
+to do - disable on board DAC (not used in V1, I2C instead)
+Check pinouts for SPI/Single channel HV
+Refer to V1 schematic from here:
+https://www.ohwr.org/attachments/3847/CosmicPiV1point0.zip
+*/
+
 #include <SPI.h>
 #include <Wire.h>
 //updated to include a whole bunch of extra functions 120818