diff --git a/Hardware:-Universal-Com-Port.md b/Hardware:-Universal-Com-Port.md
index 1ed19f2..cdafb0c 100644
--- a/Hardware:-Universal-Com-Port.md
+++ b/Hardware:-Universal-Com-Port.md
@@ -15,4 +15,6 @@ Hardware ID: `0x000D`
 | `2` | `FRONT_PORT_OUT` | `20 kJ` | Copies 8 words starting from the address in X to the object directly in front of the cubot if this object has a Universal Com Port as well. The B register is set if the operation succeeded, it is reset otherwise  |
 | `3` | `SELF_OUT` | `1 kJ` | Copies 8 words starting from the address in X to the internal message buffer. The B register is set if the operation succeeded, it is reset otherwise |
 
-Note that a Cubot can send a message to another Cubot's internal buffer, which will be emptied into his console screen. Currently, the [Radio Tower](https://github.com/simon987/Much-Assembly-Required/wiki/Radio-Tower) is the only other object with a Com Port.
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+Note that a Cubot can send a message to another Cubot's internal buffer, which will be emptied into his console screen. Currently, the [Radio Tower](https://github.com/simon987/Much-Assembly-Required/wiki/Radio-Tower) is the only other object with a Com Port.
+
+* As of 2017-12-30, the B register is left untouched by the Hardware
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