diff --git a/docs/formats.html b/docs/formats.html
index 3eb76b2..2bee92d 100644
--- a/docs/formats.html
+++ b/docs/formats.html
@@ -594,6 +594,18 @@ In input, the next byte or bytes must match the checksum.
href="https://en.wikipedia.org/wiki/Longitudinal_redundancy_check">Wikipedia.
%<hexlrc>
One byte. The LRC for the hex digits. (Other characters are ignored.)
+ %<leybold>
+ One byte. Used by some Leybold products. 255-bytesum%255 (+32 if result would be <32)
+ %<brksCryo>
+ One byte. Used by Brooks Cryopumps.
+ %<CPI>
+ One byte. Used by TRIUMF CPI RF amplifier.
+ %<bitsum>
or %<bitsum8>
+ One byte. Number of 1 bits in all characters.
+ %<bitsum16>
+ Two bytes. Number of 1 bits in all characters.
+ %<bitsum32>
+ Four bytes. Number of 1 bits in all characters.