add explanation

eth/protocol.go

@@ -38,6 +38,10 @@ const (
 	xdpos22 = 101 //xdpos2.2 = eth65
 )
 
+// XDC needs the below functions because direct number equality doesn't work (eg. version >= 63)
+// we should try to match protocols 1 to 1 from now on, bump xdpos along with any new eth (eg. eth66 = xdpos23 only)
+// try to follow the exact comparison from go-ethereum as much as possible (eg. version >= 63 <> isEth63OrHigher(version))
+
 func isEth63(version int) bool {
 	switch {
 	case version == 63:
@@ -48,7 +52,6 @@ func isEth63(version int) bool {
 		return false
 	}
 }
-
 func isEth64(version int) bool {
 	switch {
 	case version == 64:
@@ -57,7 +60,6 @@ func isEth64(version int) bool {
 		return false
 	}
 }
-
 func isEth65(version int) bool {
 	switch {
 	case version == 65: