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diff --git a/CREDITS.md b/CREDITS.md
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 * For information about cbddlp file format
 * https://github.com/Photonsters
 
+### Cliff L. Biffle
+* Catibo: read/write/analyze CTB, CBDDLP, and PHZ files
+* For information about cbddlp and cbt file format
+* https://github.com/cbiffle/catibo
+
 ### Jason S. McMullan (ezrec)
 
 * For ideas and permission to use his project (uv3dp)