picodlp-control: add comment about reading register

diff --git a/packages/i2c-tools/picodlp-control/picodlp-control b/packages/i2c-tools/picodlp-control/picodlp-control
index 4254dfb..dd7d9bf 100755 (executable)
--- a/packages/i2c-tools/picodlp-control/picodlp-control
+++ b/packages/i2c-tools/picodlp-control/picodlp-control
@@ -8,6 +8,10 @@ PICO_ADDRESS="0x1b"
 PICO_OPTION="$1"
 PICO_OPTION_VALUE="$2"
 
+# Reading a register needs something like:
+#   bus3-i2c 0x1b wb 0x15 0x08
+#   bus3-i2c 0x1b vb4
+
 case ${PICO_OPTION_VALUE} in
 "0")
                        ;;