diff --git a/modhex.go b/modhex.go
index 0cda637..0ae17bd 100644
--- a/modhex.go
+++ b/modhex.go
@@ -7,11 +7,13 @@ import (
 	"strings"
 )
 
+// modhex character table for encoding
 const modhexTable = "cbdefghijklnrtuv"
 
 var modhexMap map[byte]byte
 
 func init() {
+	// create a map from byte to modhex for decoding
 	modhexMap = make(map[byte]byte)
 	for i, v := range []byte(modhexTable) {
 		modhexMap[v] = byte(i)