1 files changed, 6 insertions, 1 deletions

diff --git a/12.-Appendix.md b/12.-Appendix.md
index 135c798..7772ea6 100644
--- a/12.-Appendix.md
+++ b/12.-Appendix.md
@@ -175,4 +175,9 @@ Finally, in kraken_doa_start.sh, comment out the eval line, and uncomment the so
 source /home/krakenrf/miniforge3/etc/profile.d/conda.sh #<- required for systemd auto startup
 #eval "$(conda shell.bash hook)"
 conda activate kraken
-```
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+```
+
+# KrakenSDR Manual Bias Tee Control
+When using the KrakenSDR as a standard SDR, you can activate each individual bias tee using the rtl_biast and -g flag to select the correct GPIO. GPIO 0 is for the noise source. GPIO's 1,2,3,4,5 are for the bias tees.
+
+For example to turn on the bias tee on the first port `rtl_biast -g1 -b1`.
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