diff --git a/SiliconTorch/README.md b/SiliconTorch/README.md
index fe263b9b0c0772cdaa860e328c771e424ba45026..ce896f87454ed9113b3d66af9c024544176757cb 100644
--- a/SiliconTorch/README.md
+++ b/SiliconTorch/README.md
@@ -4,3 +4,18 @@ SiliconTorch
`SiliconTorch` is the `python` reference implementation for the `fxCyanF`-protocol
It will be moved to a separate repo when it matures
+
+
+Protocol documentation
+----------------------
+
+Documentation of the used (network-)protocols inside of `SiliconTorch`
+
+
+### `fxCyan`
+
+The name of the packet envelope and the static header ob `CyanBus`.
+
+Packets look like below, `CRC` is calculated over payload only.
+
+
diff --git a/SiliconTorch/doc/fxCyan.edn b/SiliconTorch/doc/fxCyan.edn
new file mode 100644
index 0000000000000000000000000000000000000000..e63e4e7481e982f2a0cdcbdf0471b4e2bca3288f
--- /dev/null
+++ b/SiliconTorch/doc/fxCyan.edn
@@ -0,0 +1,9 @@
+
+;; This is bytefield-svg code to describe the fxCyan packet envelope
+
+(draw-column-headers)
+(draw-box "b'fxCyan'" {:span 6})
+(draw-box "Size" {:span 2})
+(draw-gap "Payload")
+(draw-box "CRC-XY" {:span 4}) ;; TODO: Which CRC algorithm exactly???
+(draw-bottom)
diff --git a/SiliconTorch/doc/fxCyan.svg b/SiliconTorch/doc/fxCyan.svg
new file mode 100644
index 0000000000000000000000000000000000000000..5e4b52a75ab89bdce5ba3942eb01f591ef666178
--- /dev/null
+++ b/SiliconTorch/doc/fxCyan.svg
@@ -0,0 +1 @@
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>5</text><text x="300" y="8" font-family="Courier New, monospace" font-size="11" dominant-baseline="middle" text-anchor="middle" >6</text><text x="340" y="8" font-family="Courier New, monospace" font-size="11" dominant-baseline="middle" text-anchor="middle" >7</text><text x="380" y="8" font-family="Courier New, monospace" font-size="11" dominant-baseline="middle" text-anchor="middle" >8</text><text x="420" y="8" font-family="Courier New, monospace" font-size="11" dominant-baseline="middle" text-anchor="middle" >9</text><text x="460" y="8" font-family="Courier New, monospace" font-size="11" dominant-baseline="middle" text-anchor="middle" >a</text><text x="500" y="8" font-family="Courier New, monospace" font-size="11" dominant-baseline="middle" text-anchor="middle" >b</text><text x="540" y="8" font-family="Courier New, monospace" font-size="11" dominant-baseline="middle" text-anchor="middle" >c</text><text x="580" y="8" font-family="Courier New, monospace" font-size="11" dominant-baseline="middle" text-anchor="middle" >d</text><text x="620" y="8" font-family="Courier New, monospace" font-size="11" dominant-baseline="middle" text-anchor="middle" >e</text><text x="660" y="8" font-family="Courier New, monospace" font-size="11" dominant-baseline="middle" text-anchor="middle" >f</text><line x1="40" y1="15" x2="280" y2="15" stroke="#000000" stroke-width="1" /><line x1="40" y1="45" x2="280" y2="45" stroke="#000000" stroke-width="1" /><line x1="280" y1="15" x2="280" y2="45" stroke="#000000" stroke-width="1" /><line x1="40" y1="15" x2="40" y2="45" stroke="#000000" stroke-width="1" /><text font-size="18" font-family="Palatino, Georgia, Times New Roman, serif" x="160" y="31" text-anchor="middle" dominant-baseline="middle" >b'fxCyan'</text><line x1="280" y1="15" x2="360" y2="15" stroke="#000000" stroke-width="1" /><line x1="280" y1="45" x2="360" y2="45" stroke="#000000" stroke-width="1" /><line x1="360" y1="15" x2="360" y2="45" stroke="#000000" stroke-width="1" /><line x1="280" y1="15" x2="280" y2="45" stroke="#000000" stroke-width="1" /><text font-size="18" font-family="Palatino, Georgia, Times New Roman, serif" x="320" y="31" text-anchor="middle" dominant-baseline="middle" >Size</text><line x1="360" y1="15" x2="680" y2="15" stroke="#000000" stroke-width="1" /><line x1="680" y1="15" x2="680" y2="45" stroke="#000000" stroke-width="1" /><line x1="360" y1="15" x2="360" y2="45" stroke="#000000" stroke-width="1" /><text font-size="18" font-family="Palatino, Georgia, Times New Roman, serif" x="520" y="31" text-anchor="middle" dominant-baseline="middle" >Payload</text><text font-size="11" font-family="Courier New, monospace" font-style="normal" dominant-baseline="middle" x="35" y="30" text-anchor="end" >00</text><text font-size="11" font-family="Courier New, monospace" font-style="normal" dominant-baseline="middle" x="35" y="60" text-anchor="end" >10</text><line x1="40" y1="45" x2="40" y2="60" stroke="#000000" stroke-width="1" /><line x1="680" 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